Citations with the tag: SCATTERING (Physics)
Results 1 - 50
- Magnetic correlations in the bilayer manganite La1.2Sr1.8Mn2O7.
Rosenkranz, S.; Osborn, R.; Mitchell, J.F.; Vasiliu-Doloc, L.; Lynn, J.W.; Sinha, S.K.; Argyriou, D.N. // Journal of Applied Physics; 6/1/1998 Part 2 of 2, Vol. 83 Issue 11, p7348Presents a study which focused on the magnetic correlations in the double-layer manganite La1.2Sr1.8Mn2O7, using neutron scattering. Origin of colossal magnetoresistance; What is the two-dimensional character of spin correlations and the correlations length within the methacrylonitrile planes;...
- Measurement of the Hall scattering factor in 4H and 6H SiC epilayers from 40 to 290 K and in...
Rutsch, G.; Devaty, R.P.; Choyke, W.J.; Langer, D.W.; Rowland, L.B. // Journal of Applied Physics; 8/15/1998, Vol. 84 Issue 4, p2062Discusses the determination of the relationship between the measurable Hall coefficient RH and the free carrier concentration using the Hall scattering coefficient rH. Measurement of the Hall scattering factor in nitrogen doped 4H and 6H epitaxial layers; Variation of the effective Hall...
- The Milne Problem Solution for the Temporal Correlation Function of an Electromagnetic Field.
Kuzmin, V. L. // Optics & Spectroscopy; Sep2002, Vol. 93 Issue 3, p439The problem of multiple scattering of light by a medium occupying a half-space is solved in backscattering geometry. The solution obtained in the framework of the Wiener-Hopf method, which is a generalization of the well-known Milne solution for the electromagnetic field, has made it possible...
- The Space-Time Correlation of the Intensity of a Speckle Field Formed as a Result of Scattering of Focused Coherent Radiation by a Capillary Liquid Flow Containing Scattering Particles.
Fedosov, I. V.; Tuchin, V. V. // Optics & Spectroscopy; Sep2002, Vol. 93 Issue 3, p434The properties of a dynamic speckle field formed as a result of scattering of a focused laser beam by a flow of a scattering liquid in a capillary, which are the most important from the viewpoint of practical application, were studied experimentally. The dependences of the parameters of the...
- Reactive scattering theory for molecular transitions in time-dependent fields.
Peskin, Uri; Miller, William H. // Journal of Chemical Physics; 3/8/1995, Vol. 102 Issue 10, p4084A new approach is introduced for computing probabilities of molecular transitions in time-dependent fields. The method is based on the stationary (t,t�) representation of the Schr�dinger equation and is shown to be equivalent to infinite order time-dependent perturbation theory....
- A sapphire cell for neutron scattering at elevated pressures.
Zielinski, Richard G.; Paulaitis, Michael E.; Kaler, Eric W. // Review of Scientific Instruments; Jul96, Vol. 67 Issue 7, p2612Describes a pressure cell for cold neutron scattering from liquid solutions at elevated pressures. Construction of the scattering cell in order to transmit neutrons that scatters at varying angles; Hydrostatic testing of the cell.
- New target cell design for alkali and alkaline earth vapor scattering experiments.
Coggiola, M. J.; Peterson, J. R.; Leon, R. L. // Review of Scientific Instruments; Jun85, Vol. 56 Issue 6, p1248A scattering cell is described that is suitable for use with targets of alkali and alkaline earth vapors in beam-static gas collision experiments. A novel feature of this vapor oven design is that the entire assembly can be rapidly moved into and out of the projectile beam path. When used with...
- Apparatus for measuring the stopping power of active materials evaporated in situ and characterized by Auger electron spectrometry and Rutherford backscattering.
Semrad, D.; Bauer, P.; Eder, K.; Obermann, W. // Review of Scientific Instruments; Jul86, Vol. 57 Issue 7, p1368An ultrahigh-vacuum scattering chamber working in the low 10-9-mbar range is described. It is attached to a standard O-ring sealed beam transport system of an electrostatic accelerator. Twelve targets can be prepared in situ, one by one, by evaporating the material onto backings, which are...
- Comment on ��On the spatial and temporal resolution of ion temperature measurements based on neutral beam scattering�� [Rev. Sci. Instrum. 58, 1320 (1987)].
van Heesch, E. J. M. // Review of Scientific Instruments; Jul87, Vol. 58 Issue 7, p1322The discrepancies found by Donn� and Barbian [A. J. H. Donn� and E. P. Barbian, Rev. Sci. Instrum. 58 (1987)] can be attributed principally to the choice of experimental and technical limits, basic assumptions, and definitions.
- On the spatial and temporal resolution of ion temperature measurements based on neutral beam scattering: Comment on ��Design of an ion temperature diagnostic based on neutral beam scattering�� [Rev. Sci. Instrum. 57, 1792...
Donn�, A. J. H.; Barbian, E. P. // Review of Scientific Instruments; Jul87, Vol. 58 Issue 7, p1320Small-angle neutral beam scattering is a promising technique to measure the local ion temperature in a hot plasma. We will show that in general a 10% accuracy in the temperature measurement can be obtained with a temporal resolution in the order of 1 ms and a spatial resolution of 10 cm. These...
- Three-dimensional computer simulation of ion beam scattering by an electrostatic reflector.
Nakamura, M.; Tsuruda, K.; Hayakawa, H. // Review of Scientific Instruments; Oct87, Vol. 58 Issue 10, p1901A three-dimensional computer model was used to study the scattering of a reflected lithium ion beam by an electrostatic reflector. Results show that for ion gun systems for active space plasma experiment applications, beam scattering of less than 1� can be attained with electrostatic reflectors.
- Design of a pulsed valve for high-pressure NH3 injection into supersonic beam/mass spectrometry.
Pang, Ho Ming; Lubman, David M. // Review of Scientific Instruments; Nov88, Vol. 59 Issue 11, p2460A novel design of a pulsed valve for high-pressure injection of NH3 for supersonic jet expansions is presented. This valve can operate up to 200-atm reservoir pressure at 180 �C with a pulse width down to 100 �s. This valve has been designed so that the solenoid core is not in contact with...
- Improved low-energy diffuse scattering electron-spin polarization analyzer.
Scheinfein, M. R.; Pierce, D. T.; Unguris, J.; McClelland, J. J.; Celotta, R. J.; Kelley, M. H. // Review of Scientific Instruments; Jan89, Vol. 60 Issue 1, p1An improved low-energy diffuse scattering electron-spin polarization analyzer is described. It is based on the low-energy (150 eV) diffuse scattering of polarized electrons from polycrystalline evaporated Au targets. By collecting large solid angles and efficiently energy filtering the scattered...
- Small-angle scattering technique with a simplified angle selection.
K�ttel, O. M. // Review of Scientific Instruments; Jun89, Vol. 60 Issue 6, p1075A simplified homodyne small-angle scattering technique for plasma fluctuation measurements is described. The local oscillator is produced by a beam splitter which lies just behind the scattering area in the main laser beam. The scattered radiation is reflected from the beam splitter and directed...
- Investigation of Low-Energy Scattering in the nnpp System on the Basis of Differential Equations for Yakubovsky Components in Configuration Space.
Filikhin, I. N.; Yakovlev, S. L. // Physics of Atomic Nuclei; Jan2000, Vol. 63 Issue 1, p55The s-wave differential equations for the Yakubovsky components characterizing the nnpp system have been solved by the method of cluster reduction. Two-cluster scattering at energies below the three-particle threshold in the singlet and triplet spin states has been considered. The MT I-III...
- Effect of Rescattering on Polarization Observables of the Reaction ?d?ppp in the Delta-Resonance Region.
Loginov, A. Yu.; Sidorov, A. A.; Stibunov, V. N. // Physics of Atomic Nuclei; Mar2000, Vol. 63 Issue 3, p391The effect of pion-nucleon and nucleon-nucleon rescatterings on polarization observables of the reaction ?d ? ppp[sup -] are calculated in the delta-isobar region. Pion-nucleon and nucleon-nucleon rescatterings are considered on the basis of a diagrammatic approach. Lorentz invariant expressions...
- Unitarity, (Anti)Shadowing, and Black-Disk Limit.
Desgrolard, P.; Jenkovszky, L.; Struminsky, B. V. // Physics of Atomic Nuclei; May2000, Vol. 63 Issue 5, p891By using realistic models for elastic hadron scattering, we demonstrate that, at current accelerator energies, the s-channel unitarity bound is safe and is not to be reached until 10[sup 5] GeV, while the black-disk limit is saturated around 6 TeV. It will be followed by a larger transparency of...
- Near-Threshold Amplitude of Pion�Deuteron Scattering: One-Loop Contributions.
Tarasov, V. E.; Baru, V. V.; Kudryavtsev, A. E. // Physics of Atomic Nuclei; May2000, Vol. 63 Issue 5, p801The one-loop expression for the absorptive correction to the pd scattering length is discussed. Relevant Feynman diagrams are calculated both in the relativistic and in the nonrelativistic formalism. A simple expression is obtained for the one-loop correction that arises in the pd scattering...
- Determination of the pp Scattering Lengths from Data on pN?ppN Reactions by the Method of Roy Equations.
Mayorov, V. N.; Patarakin, O. O.; Tikhonov, V. N. // Physics of Atomic Nuclei; Sep2000, Vol. 63 Issue 9, p1612Fitted phase-shift curves from the threshold to the dipion mass, which is equal to 1 GeV, are constructed on the basis of all available experimental values of the S- and P-wave phase shifts for five charged channels of pion-pion scattering. The resulting phase-shift curves are introduced in the...
- Intranuclear Cascade in the Interactions of Neutrinos with Neon Nuclei.
Vataga, E. S.; Murzin, V. S.; Aderholz, M.; Ammosov, V. V.; Asratian, A. S.; Barth, M.; Bingham, H. H.; Brucker, E. B.; Burnstein, R. A.; Chatterjee, T. K.; Clayton, E. C.; Ermolov, P. F.; Erofeeva, I. N.; Faulkner, P. J. W.; Gapienko, G. S.; Guy, J.; Hanlon, J.; Harigel, G.; Ivanilov, A. A.; Jain, V. // Physics of Atomic Nuclei; Sep2000, Vol. 63 Issue 9, p1574A method is developed for separating vN interactions from interactions involving an intranuclear cascade in vNe scattering at a mean neutrino energy of 145 GeV. The fraction of events featuring a cascade is evaluated by using a sample of vNe charged-current interactions. It is found that the...
- Observation of an a-Cluster Structure in [sup 36]Ar.
Goldberg, V. Z.; Rogachev, G. V.; Brenner, M.; K�llman, K.-M.; L�nnroth, T.; Rozhkov, M. V.; Torilov, S.; Trzaska, W. H.; Wolski, R. // Physics of Atomic Nuclei; Sep2000, Vol. 63 Issue 9, p1518Excitation functions for [sup 32]S + a elastic scattering are measured by a new method based on inverse kinematics and a thick gas target. Data corresponding to the [sup 36]Ar excitation range 12-16 MeV are treated within the R-matrix approach. Spin-parity assignments are given for over 40 new...
- Weak and Magnetic Inelastic Scattering of Antineutrinos on Atomic Electrons.
Fayans, S. A.; Mikaelyan, L. A.; Sinev, V. V. // Physics of Atomic Nuclei; Aug2001, Vol. 64 Issue 8, p1475Neutrino scattering on electrons is considered as a tool for laboratory searches for the neutrino magnetic moment. Inelastic ?[sub e]e[sup -] scattering on electrons bound in the germanium (Z = 32) and iodine (Z = 53) atoms is studied for antineutrinos generated in a nuclear reactor core and in...
- Elastic and Inelastic Scattering of p Mesons on [sup 7]Li Nuclei.
Zhusupov, M. A.; Ibraeva, E. T.; Prmantayeva, B. A. // Physics of Atomic Nuclei; Aug2001, Vol. 64 Issue 8, p1449Within the diffraction theory of multiple scattering, the differential cross sections for elastic and inelastic pion scattering on a [sup 7]Li nucleus are calculated for the case where the final nucleus is either in the ground or in the first excited state. The nuclear wave function is set to...
- Pion Scattering on [sup 3]H and [sup 3]He Nuclei in the ?[sub 33](1232) Region.
Briscoe, W. J.; Kudryavtsev, A. E.; Strakovsky, I. I.; Tarasov, V. E. // Physics of Atomic Nuclei; Aug2001, Vol. 64 Issue 8, p1430Elastic scattering of p[sup �] mesons on �H and �He nuclei at energies around the ?[sub 33](1232) resonance is considered. The amplitudes for single and double scattering are calculated on the basis of the nonrelativistic diagram technique. The spin and isospin structure of pion-nucleon...
- Adiabatic Hyperspherical Approach to Describing Low-Energy Mesic-Atom Scattering.
Abramov, D. I.; Gusev, V. V.; Ponomarev, L. I. // Physics of Atomic Nuclei; Aug2001, Vol. 64 Issue 8, p1364The adiabatic hyperspherical approach developed previously is used to describe the asymmetric mesic-atom scattering a� + b ? a� + b, a + b� (a, b = p, d, t) in the collision-energy range 10[sup -3] = e = 10� eV. Boundary conditions for J ? 0 scattering states are formulated, and partial...
- Aspects of Alpha-Particle Scattering and Structure of the Nuclear Surface.
Brenner, M. W.; Gridnev, K. A.; Belov, S. E.; Ershov, K. W.; Indola, E. // Physics of Atomic Nuclei; Apr2002, Vol. 65 Issue 4, p612The interaction of a particles above 5 MeV with a 2s-1d target is dominated by resonances. It cannot be described only in terms of a mean-field one-body potential. An analysis of the elastic a-particle scattering by [sup 28]Si encourages the comprehension of the resonance states to be mainly...
- Structure of [sup 10]C and [sup 11]C from Elastic and Inelastic Scattering on a Proton Target.
Jouanne, C.; Alamanos, N.; Auger, F.; Drouart, A.; Gillibert, A.; Lapoux, V.; Lobo, G.; Nalpas, L.; Pollacco, E.C.; Sida, J.L.; Blumenfeld, Y.; Khan, E.; Suomijarvi, T.; Zerguerras, T.; Lagoyannis, A.; Pakou, A.; Roussel-Chomaz, P.; Savajols, H.; Musumarra, A. // Physics of Atomic Nuclei; Aug2003, Vol. 66 Issue 8, p1508We measured elastic and inelastic scattering to the low-lying states of [sup 10]C and [sup 11]C isotopes on a proton target with respective incident energies 45.3 and 40.6 A MeV. Data are analyzed with a microscopic complex potential. Elastic data are sensitive to the rms matter radius, which...
- Regional Variability of the Phenomenon of Sound Penetration into Shadow Zones in the Ocean with Fine-Structure Stratification.
Gostev, V. S.; Shvachko, R. F. // Acoustical Physics; Sep2001, Vol. 47 Issue 5, p540The regional variability of the phenomenon of the shadow zone insonification in the ocean is manifested in the variability of the main parameters of the sound signals that penetrate into these zones because of the scattering by the fine-structure inhomogeneities of the refractive index. The...
- Relationship between the Amplitude and Phase of a Signal Scattered by a Point-Like Acoustic Inhomogeneity.
Burov, V. A.; Morozov, S. A. // Acoustical Physics; Nov2001, Vol. 47 Issue 6, p659Wave scattering by a point-like inhomogeneity, i.e., a strong inhomogeneity with infinitesimal dimensions, is described. This type of inhomogeneity model is used in investigating the point-spread functions of different algorithms and systems. Two approaches are used to derive the rigorous...
- Utilization of Double Scanning in Ultrasonic Testing to Improve the Quality of the Scatterer Images.
Bazulin, E. G. // Acoustical Physics; Nov2001, Vol. 47 Issue 6, p649Derivation of a formula for double scanning, when a radiator and a receiver move independently along parallel straight lines, is presented. Advantages of this technique are discussed in comparison with the method of projection in the spectral space, which is also used for a coherent...
- Coherent control of bimolecular collisions: Collinear reactive scattering.
Holmes, Daniel; Shapiro, Moshe; Brumer, Paul // Journal of Chemical Physics; 11/22/96, Vol. 105 Issue 20, p9162A recently proposed approach to the coherent control of bimolecular reactions is applied to collinear models of H+H2, D+H2, and F+H2 scattering. Reactive scattering probabilities above the reaction threshold are shown to be controllable in these systems over a wide range, often nearing total...
- Rayleigh�Brillouin scattering studies of segmental fluctuations in poly(siloxanes).
Wang, C. H.; Fytas, G.; Zhang, J. // Journal of Chemical Physics; 4/1/85, Vol. 82 Issue 7, p3405New results from a detailed temperature dependent Rayleigh�Brillouin study of siloxane polymers are reported. The study includes the examination of the effect of the relaxation of the longitudinal stress modulus on the propagation behavior of the thermally driven acoustic wave in the 109 Hz...
- Anisotropic intermolecular potentials for HeC6H6 and HeC5H5N from total differential cross section measurements.
Brandt, R.; Henkel, M.; Pfeil, B.; Seidel, W. // Journal of Chemical Physics; 7/1/91, Vol. 95 Issue 1, p135Differential cross section (DCS) measurements are reported for scattering of a He atomic beam by crossed beams of C6H6 and C5H5N. Damping of the DCS diffraction oscillations is used to extract reliable anisotropic intermolecular potentials, applying the infinite order sudden approximation...
- The static scattering function and optical birefringence of a deformed, ideal polymer chain.
Altenberger, Andrzej R.; Rosa, Epaminondas; Dahler, John S. // Journal of Chemical Physics; 12/15/91, Vol. 95 Issue 12, p9248An exact formula is derived for the van Hove static scattering function of an ideal chain under traction. Results obtained from this formula are applied to the description of affinely deformed elastomers. Calculations are performed for two models of polymeric chains with the aim of establishing...
- Rotational level dependence of predissociation in the v�=3 level of OH A 2S+.
Heard, Dwayne E.; Crosley, David R.; Jeffries, Jay B.; Smith, Gregory P.; Hirano, Akira // Journal of Chemical Physics; 3/15/92, Vol. 96 Issue 6, p4366Using laser-induced fluorescence in a low-pressure flame, relative predissociation rates have been determined as a function of rotational level in the v�=3 level of the A 2S+ state of the OH molecule. A Boltzmann analysis of an excitation scan in the (3,0) band yields an apparent temperature...
- Dynamics of surface-aligned photochemistry (theory). II. Localized H-atom scattering in the HBr(ad)/LiF(001)+h? system.
Barclay, V. J.; Jack, D. B.; Polanyi, J. C.; Zeiri, Y. // Journal of Chemical Physics; 12/15/92, Vol. 97 Issue 12, p9458The angular and energy distributions of 1.1 and 2.6 eV H-atom scattering from a LiF(001) surface are compared for two different sources of hot H-atoms (1) localized H-atoms produced by the photolysis of HBr molecules adsorbed on the LiF surface; and (2) H-atoms from a beam at the same energy and...
- Quantum effects in Ar+HF rotationally inelastic scattering: A semiclassical interpretation.
Barrett, James J. C.; Mayne, Howard R.; Keil, Mark // Journal of Chemical Physics; 1/1/94, Vol. 100 Issue 1, p304Invoking a semiclassical approach to state-to-state rotationally inelastic scattering, this study seeks to determine the origin of several novel features observed in earlier quantum mechanical calculations [Rawluk et al., Chem. Phys. Lett. 202, 291 (1993)]. These features were absent from...
- The coupled three-dimensional wave packet approach to reactive scattering.
Markovic, Nikola; Billing, Gert D. // Journal of Chemical Physics; 1/15/94, Vol. 100 Issue 2, p1085A recently developed scheme for time-dependent reactive scattering calculations using three-dimensional wave packets is applied to the D+H2 system. The present method is an extension of a previously published semiclassical formulation of the scattering problem and is based on the use of...
- Collision-induced scattering in CO2 gas.
Teboul, Victor; Le Duff, Yves; Bancewicz, Tadeusz // Journal of Chemical Physics; 7/22/95, Vol. 103 Issue 4, p1384Carbon-dioxide gas rototranslational scattering has been measured at 294.5 K in the frequency range 10�1000 cm-1 at 23 amagat. The depolarization ratio of scattered intensities in the frequency range 10�1000 cm-1 is recorded. The theoretical and experimental spectra in the frequency range...
- High resolution proton energy loss spectroscopy of the high overtone vibrations in CF4.
Maring, W.; Toennies, J. P.; Wang, R. G.; Levene, H. B. // Journal of Chemical Physics; 7/22/95, Vol. 103 Issue 4, p1333Proton energy loss spectroscopy (PELS) has been used to investigate the very high overtone states of the ?3 mode in CF4. With a new scattering apparatus, which is described here in detail, it has been possible to directly measure the energy levels of the dominantly excited ?3 mode up to its 14th...
- Scattering of H2 by LiF(001) studied using a new model potential. I. Prediction of large differences in diffraction of cold beams of para-H2 and normal-H2.
Kroes, Geert-Jan; Mowrey, R. C. // Journal of Chemical Physics; 8/8/95, Vol. 103 Issue 6, p2186The close-coupling wave packet (CCWP) method has been used for performing calculations on rotationally and diffractionally inelastic scattering of H2 from LiF(001), using a model potential. The scattering from the initial j=0, 1, and 2 states was investigated at normal incidence for a collision...
- Performance of close-coupled wave packet methods for molecule-corrugated surface scattering.
Kroes, G. J.; Snijders, J. G.; Mowrey, R. C. // Journal of Chemical Physics; 9/22/95, Vol. 103 Issue 12, p5121The H2+LiF(001) system was used to investigate the performance of the hybrid close-coupling wave packet (CCWP) method and of a symmetry adapted, fully close-coupled wave packet (SAWP) method for a molecule�surface problem characterized by fairly high corrugation. In the calculations, a...
- Direct calculation of cumulative reaction probabilities from Chebyshev correlation functions.
Xie, Daiqian; Li, Shenmin; Guo, Hua // Journal of Chemical Physics; 4/15/2002, Vol. 116 Issue 15, p6391The transition-state wave packet method of Zhang and Light [J. Chem. Phys. 104, 6184 (1996)] for the direct calculation of cumulative reaction probabilities is implemented in the Chebyshev order domain to take advantage of exactness and efficiency of the Chebyshev propagator. Numerical testing...
- X-ray scattering study of the structure of water around myoglobin for several levels of hydration.
Dorbez-Sridi, R.; Corte`s, R.; Mayer, E.; Pin, S. // Journal of Chemical Physics; 4/22/2002, Vol. 116 Issue 16, p7269Water has been shown to play a crucial role in the stability and catalytic function of protein. Our purpose is to understand the modification of bulk liquid behavior when water is around myoglobin, in particular, the perturbation of liquid water structure by hydrophobic and hydrophilic sites of...
- The role of charge-transfer states of the metal-adsorbate complex in surface-enhanced Raman scattering.
Arenas, Juan F.; Soto, Juan; Toco�n, Isabel Lo�pez; Ferna�ndez, David J.; Otero, Juan C.; Marcos, Juan I. // Journal of Chemical Physics; 4/22/2002, Vol. 116 Issue 16, p7207Surfaced-enhanced Ramon scattering (SERS) spectra of pyrazine are analyzed on the basis of the properties of the electronic states of the metal-adsorbate surface complex. Ab initio CIS calculations have been carried out for the Ag[sub 2]-pyrazine complex, which have enabled us to find two...
- A quantum reactive scattering study of the spin-forbidden CH(X [sup 2]?)+N[sub 2](X [sup 1]S[sub g][sup +])?HCN(X [sup 1]S[sup +])+N([sup 4]S) reaction.
Wada, Akira; Takayanagi, Toshiyuki // Journal of Chemical Physics; 4/22/2002, Vol. 116 Issue 16, p7065The dynamics of the spin-forbidden CH(X [sup 2]?)+N[sub 2](X [sup 1]S[sub g][sup +])?HCN(X [sup 1]S[sup +])+N([sup 4]S) reaction has been studied theoretically using the reduced dimensionality quantum scattering method. Three degrees of freedom have been considered in the dynamics calculations...
- A small-angle neutron scattering investigation of the structure of highly swollen block copolymer micelles.
Castelletto, V.; Hamley, I. W.; Pedersen, J. S. // Journal of Chemical Physics; 11/1/2002, Vol. 117 Issue 17, p8124The structure of highly swollen micelles of an amphiphilic poly(oxyethylene)-poly(oxybutylene) diblock copolymer with a lengthy hydrophilic poly(oxyethylene) block has been investigated by small-angle neutron scattering (SANS). The density profile of the tethered polymer brush is obtained by...
- Collective molecular rotation in D[sub 2]O.
Shelton, David P. // Journal of Chemical Physics; 11/22/2002, Vol. 117 Issue 20, p9374The hyper-Rayleigh scattering (HRS) spectrum of liquid D[SUB2]O was measured at 90� scattering angle with linearly polarized light (VV, HV, VH, and HH polarization geometries). The VV and HV spectral profiles are similar, but the HV and VH spectral profiles are very different. This can be...
- Small-angle neutron scattering study of semiconductor microcrystallites in optical glasses.
Degiorgio, Vittorio; Banfi, GianPiero; Righini, Giancarlo; Rennie, Adrian // Applied Physics Letters; 12/31/90, Vol. 57 Issue 27, p2879The structure of semiconductor-doped glasses is studied by small-angle neutron scattering. We derive the average size of the microcrystals, and we give information on the spatial distribution of the microcrystals. A new aspect emerging from our data is the existence of a depletion region that...
- 3.4-THz quantum cascade laser based on longitudinal-optical-phonon scattering for depopulation.
Williams, Benjamin S.; Callebaut, Hans; Kumar, Sushil; Hu, Qing; Reno, John L. // Applied Physics Letters; 2/17/2003, Vol. 82 Issue 7, p1015We report the development of a quantum cascade laser, at ? = 87.2 �m, corresponding to 3.44 THz or 14.2 meV photon energy. The GaAs/Al[sub 0.15]Ga[sub 0.85]As laser structure utilizes longitudinal-optical (LO) phonon scattering for electron depopulation. Laser action is obtained in pulsed mode...
