TITLE

A surface work function measurement technique utilizing constant deflected grazing electron trajectories: Oxygen uptake on Cu(001)

AUTHOR(S)
Ermakov, A. V.; Ciftlikli, E. Z.; Syssoev, S. E.; Shuttleworth, I. G.; Hinch, B. J.
PUB. DATE
October 2010
SOURCE
Review of Scientific Instruments;Oct2010, Vol. 81 Issue 10, p105109
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
We report on the application of a novel nondestructive in-vacuum technique for relative work function measurements, employing a grazing incidence electron deflection above a sample with a planar surface. Two deflected electron beam detectors are used as a position sensitive detector to control feedback to the sample potential as the sample work function changes. With feedback the sample potential exactly follows the surface sample-size averaged work function variation, so that the deflected beam trajectory remains stable. We also discuss methods to optimize the initial electron trajectories for this method, so as to minimize unwanted effects such as from uncontrolled external magnetic fields. As the electron beam does not impinge on the surface in this new technique electron induced desorption, ionization, dissociation, and/or decomposition is not induced at the interface. Importantly also the technique allows for free access to the surfaces enabling simultaneous deposition/evaporation and/or application of other surface characterization methods. We demonstrate its application in concurrent measurements of helium atom reflectivity and work function changes taking place during molecular oxygen exposure of a Cu(001) surface. A work function measurement sensitivity and stability is demonstrated at ∼10 mV at a sampling rate of 1 Hz and after application of an ∼7 s smoothing routine. In comparison to the helium atom reflectivity measurements, the work function measurements are more sensitive to the initial O uptake, and less so to the final coverage variations and possible surface reordering at higher O coverages.
ACCESSION #
54858080

 

Related Articles

  • Dark current analysis of Si homojunction interfacial work function internal photoemission.... Yuan, H.X.; Perera, A.G.U. // Applied Physics Letters;4/24/1995, Vol. 66 Issue 17, p2262 

    Presents a theoretical analysis of dark current mechanism of silicon homojunction interfacial work function internal photoemission far infrared detectors. Calculation of thermionic field emission and field emission currents; Dependence of detector noise equivalent power on temperature;...

  • Compression of Characteristics of Trajectories in Rotating Frames vs. Nonuniform Magnetic Fields. Sarafian, Haiduke // Journal of Electromagnetic Analysis & Applications;Aug2013, Vol. 5 Issue 8, p336 

    The equation of motion of an object moving in a frictionless horizontal rotating frame is somewhat comparable to the one describing the motion of a point-like charged particle projected in a magnetic field. We show that the impact of angular velocity in the former is equivalent to the impact of...

  • Effect of a periodic electrostatic potential on magnetized particle transport. Ordonez, C. A. // Physics of Plasmas;11/1/2008, Vol. 15 Issue 11, p114507 

    A classical trajectory Monte Carlo study is reported regarding the motion of a charged particle that is caused to drift across a magnetic field toward an artificially structured boundary, which produces a spatially periodic electrostatic potential. It is found that, for the system studied, the...

  • Features of motion of interacting magnetic liquid drops. Kopylova, O. S.; Dikanskiĭ, Yu. I.; Zakinyan, R. G. // Technical Physics;Nov2006, Vol. 51 Issue 11, p1425 

    The features of simultaneous motion of two identical drops of magnetic liquid, which are determined by their hydrodynamic and magnetic interaction, are considered. The changes in the trajectories of drops initially moving in the same direction, caused by a variation of direction and magnitude of...

  • Chaotic oscillator with electron feedback and magnetic field at the cathode. Kalinin, Yu. A.; Starodubov, A. V.; Volkova, L. N. // Technical Physics Letters;Jan2010, Vol. 36 Issue 1, p50 

    The influence of a magnetic field at the cathode on the operation of a low-voltage vircator with electron feedback has been experimentally studied. It is shown that this magnetic field can significantly improve the characteristics and parameters of the vircator, provided that the field lines do...

  • Electron trajectory and growth rate in a two-stream electromagnetically pumped free electron laser and axial guide field. Mehdian, H.; Saviz, S. // Physics of Plasmas;Sep2008, Vol. 15 Issue 9, p093103 

    The effects of two-stream on electromagnetic wiggler free electron lasers (TSEMWFEL) with an axial guiding magnetic field are studied. An analysis of the two-stream steady-state electron trajectories is given by solving the equation of motion in the axial guiding magnetic field and the...

  • Microscopic observation of magnetic bacteria in the magnetic field of a rotating permanent magnet. Smid, Pieter; Shcherbakov, Valeriy; Petersen, Nikolai // Review of Scientific Instruments;Sep2015, Vol. 86 Issue 9, p1 

    Magnetotactic bacteria are ubiquitous and can be found in both freshwater and marine environments. Due to intracellular chains of magnetic single domain particles, they behave like swimming compass needles. In external magnetic fields like the Earth's magnetic field, a torque is acting on the...

  • Effect of nano-sized Sm2BaCuO5 particles addition on the pinning mechanism of Sm-Ba-Cu-O materials. Shih-Yun Chen; Ping-Chi Hseih; In-Gann Chena; Mow-Kuen Wu // Journal of Materials Research;Mar2004, Vol. 19 Issue 3, p843 

    The superconducting properties of air-processed melt-textured growth Sm-Ba-Cu-O samples with addition of small amounts (0.004 wt%, 0.4 wt%, 4 wt%) of nano-sized Sm2BaCuO5 particles (nm211) were studied. The microstructure observations show that the size distribution and morphology of the...

  • Critical magnetic fields in the rutheno-cuprates Ru(1-x)NbxSr2Eu1.4Ce0.6Cu2O10. Botello-Zubiate, M. E.; Matutes-Aquino, J. A.; Ayala-Valenzuela, O. E.; Jaime, M. // Journal of Applied Physics;Apr2012, Vol. 111 Issue 7, p07D713 

    II-type superconducting rutheno-cuprates are both interesting and challenging systems where there is a coexistence of superconductivity and magnetism, so far poorly understood. The magnetic transitions that occur before the superconducting transition in Ru-1212 are simpler and better understood...

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