TEARES: Toroidal energy- and angle-resolving electron spectrometer - Results, recent modifications and instrument performance

Journal of Electron Spectroscopy and Related Phenomena

Volumn 144-147, Issue , 2005, Pages 1005-1010

  Siggel King, M R F ^a   Lindsay, R ^a,b   Reddish, T J ^c   Seccombe, D P ^c   Quinn, F M ^a  

^a DARESBURY LABORATORY   (United Kingdom)

^b INSTITUT DE CIÈNCIA DE MATERIALS DE BARCELONA ICMAB CSIC   (Spain)

^c UNIVERSITY OF WINDSOR   (Canada)

Author keywords

Angular distribution; Charged particle optics; Photoemission; Toroidal analyser

Indexed keywords

CHARGED PARTICLES; ELECTRON SPECTROSCOPY; KINETIC ENERGY; MONOCHROMATORS; PARAMETER ESTIMATION; PHOTOEMISSION; SYNCHROTRON RADIATION;

ANGULAR DISTRIBUTION; CHARGED PARTICLE OPTICS; TOROIDAL ANALYZER; TOROIDAL ENERGY;

SPECTROMETERS;

EID: 17544381023     PISSN: 03682048     EISSN: None     Source Type: Journal    
DOI: 10.1016/j.elspec.2005.01.101     Document Type: Conference Paper

References (11)

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9. The 'dipole plane' is perpendicular to the synchrotron light propagation direction. The so-called 'non-dipole plane' contains both the propagation direction and the electric field vector of the synchrotron light, and is physically close to the horizontal at a synchrotron. The non-dipole plane contains contributions from both the dipole interactions and non-dipole interactions such as electric quadrupole and magnetic dipole interactions.
10. See for example O. Hemmers, R. Guillemin, E.P. Kanter, B. Krässig, D.W. Lindle, S.H. Southworth, R. Wehlitz, J. Baker, A. Hudson, M. Lotrakul, D. Rolles, W.C. Stolte, I.C. Tran, A. Wolska, S.W. Yu, M.Ya. Amusia, K.T. Cheng, L.V. Chernysheva, W.R. Johnson, and S.T. Manson Phys. Rev. Lett. 91 2003 053002 and references therein
11. The expected effect of increasing the spectrometer entrance apertures, is to decrease the background counts due to the incident light hitting the analyser entrance apertures. This increase in analyser entrance aperture also results in a decrease in the resolution (increase in peak widths) by a factor of ∼2. Although the angle-defining aperture was only increased slightly, the analyser now accepts a larger angular range of electrons in the energy-dispersive (vertical) dimension due to the increase in the entrance aperture. The magnitude of the new angular range is now sufficiently large to expect 'tails' on the low kinetic energy side of the peaks. Increasing the skimmer slit will permit more background electrons, resulting from the inability of the spectrometer to discriminate in the horizontal plane, to pass though the spectrometer. However, this increase is small relative to the decrease in background electrons resulting from increasing the height of the analyser entrance apertures. Adding the mesh shield around the interaction region ensures the electrostatic potential at the interaction region remains constant, at ground, so the peaks should no longer shift in kinetic energy as a function of the voltages on the entrance lens.