TITLE

Mathematical model for predicting the molecular intensity of a solenoid-actuated pulsed beam source

AUTHOR(S)
Zou, B. S.; Dudukovic, M. P.; Mills, P. L.
PUB. DATE
December 1993
SOURCE
Review of Scientific Instruments;Dec1993, Vol. 64 Issue 12, p3492
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A mathematical model for evaluating the molecular intensity produced by a solenoid-actuated pulsed beam source is described. The particular source studied here is used to introduce reactant gas pulses at various user-specified intervals into a fixed-bed microreactor system for transient catalysis studies where quantification of the inlet pulse intensity is required for data analysis. The model equations which describe the beam source performance utilize relationships from one-dimensional isentropic gas expansion, gas effusion through a small hole, and macroscopic mass balances around the valve orifice from which a closed-form algebraic expression for the pulse intensity is obtained. The parameters in this expression represent observables which include the ideal gas specific heat capacity ratio, the stagnation properties of the gas in the supply chamber of the beam source, and the beam valve driver settings. Comparisons between experimental and predicted values for the pulse intensities, where the latter are of the order 1017 molecules per pulse, show excellent agreement.
ACCESSION #
9782238

 

Related Articles

  • A convenient modification to the Newport pulsed molecular-beam valve. Brock, L.R.; Pilgrim, J.S.; Robbins, D.L.; Duncan, M.A. // Review of Scientific Instruments;Aug1996, Vol. 67 Issue 8, p2989 

    Describes a modification to Newport Corp.'s BV-100 double solenoid pulsed molecular-beam valve that replaces the Viton tip seal with an O-ring-based plug. Flaw of the BV-100's sealing mechanism; Production of the same characteristic for the short and cold gas pulses as the originally described...

  • Simulation and analysis of solenoidal ion sources. Alderwick, A. R.; Jardine, A. P.; Hedgeland, H.; MacLaren, D. A.; Allison, W.; Ellis, J. // Review of Scientific Instruments;Dec2008, Vol. 79 Issue 12, p123301 

    We present a detailed analysis and simulation of solenoidal, magnetically confined electron bombardment ion sources, aimed at molecular beam detection. The aim is to achieve high efficiency for singly ionized species while minimizing multiple ionization. Electron space charge plays a major role...

  • Note: A short-pulse high-intensity molecular beam valve based on a piezoelectric stack actuator. Abeysekera, Chamara; Joalland, Baptiste; Yuanyuan Shi; Kamasah, Alexander; Oldham, James M.; Suits, Arthur G. // Review of Scientific Instruments;2014, Vol. 85 Issue 11, p1 

    Solenoid and piezoelectric disk valves, which are widely used to generate molecular beam pulses, still suffer from significant restrictions, such as pulse durations typically >50 µs, low repetition rates, and limited gas flows and operational times. Much of this arises owing to the limited...

  • Publisher's Note: 'Effect of in-situ oxygen on the electronic properties of graphene grown by carbon molecular beam epitaxy' [Appl. Phys. Lett. 100, 133107 (2012)]. Park, Jeongho; Mitchel, W. C.; Elhamri, Said; Back, Tyson C. // Applied Physics Letters;6/18/2012, Vol. 100 Issue 25, p259902 

    The article presents the publisher's note about the effect of in-situ oxygen on electronic properties of graphene grown by carbon molecular beam epitaxy.

  • How much, how big, how fast.  // Machine Design;12/14/95, Vol. 67 Issue 22, p84 

    Discusses the simulation of solenoids. Design of electromechanical actuators; Calculation of force and closure speed; Improvement of solenoid linearity; Complication by several simultaneous effects.

  • Solenoids.  // Design News;12/26/94, Vol. 50 Issue 25, p573 

    Lists companies in the United States that manufacture solenoids. Linear; Linear, subminiature; Proportional; Rotary.

  • Molecular beam epitaxy of alternating-strain ZnSe-based multilayer heterostructures for blue-green lasers. Ivanov, S. V.; Toropov, A. A.; Sorokin, S. V.; Shubina, T. V.; Il’inskaya, N. D.; Lebedev, A. V.; Sedova, I. V.; Kop’ev, P. S.; Alferov, Zh. I.; Lugauer, H.-J.; Reuscher, G.; Keim, M.; Fischer, F.; Waag, A.; Landwehr, G. // Semiconductors;Oct98, Vol. 32 Issue 10, p1137 

    The effect of partial ordering of impurities (correlated along one direction and uncorrelated along the other) on the kinetic coefficients is considered. It is shown that the geometry of the spatial impurity distribution by itself has no effect on the diffusion coefficient or conductivity for...

  • Patterning-based investigation of the length-scale dependence of the surface evolution during multilayer epitaxial growth. Shah, S.; Garrett, T. J.; Limpaphayom, K.; Tadayyon-Eslami, T.; Kan, H. C.; Phaneuf, R. J. // Applied Physics Letters;11/24/2003, Vol. 83 Issue 21, p4330 

    We describe an investigation of the lateral length scale dependence of the evolution of topographical corrugations during multilayer molecular beam epitaxial growth in the GaAs/AlAs multilayer system. By patterning the substrate at series of well-defined spatial periods, we are able to study...

  • Growth mode and strain relaxation of InAs on InP (111)A grown by molecular beam epitaxy. Hanxuan Li; Daniels-Race, Theda // Applied Physics Letters;3/8/1999, Vol. 74 Issue 10, p1388 

    Studies the growth mode and strain relaxation of molecular-beam epitaxy grown InAs on InP substrates. Stranski-Krastanov mode followed by InAs grown on InAlAs/InP; Formation of self-organized quantum dots and relaxed InAs islands; Luminescence efficiency of the samples.

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics