inverse photoelectron spectroscopy abbr., KRIPS; IPES otherwise k-resolved inverse photoemission spectroscopy (rus. спектроскопия, обратная фотоэмиссионная abbr., ОФЭС) — a method of electron spectroscopy to analyse structure of electronic states of a solid surface.

Description

In the process of inverse photoemission (see Fig. a) an electron with energy eU falls on a solid surface and occupies the excited state E1 = eU after which it transits to the lower unoccupied state E2. The energy released in this process is carried away by photons . There are two methods to record the spectrum of unoccupied states:

• isochromate spectroscopy, where the energy of primary electrons is a variable and the yield of photons with fixed energy is a measured value (Fig. b);

• bremsstrahlen spectroscopy, where the energy of primary electrons is a fixed value and the spectrum of emitted photons is recorded (Fig. c).

To determine the law of dispersion E(k) of unoccupied electronic states in the surface layer of a solid body, a sufficiently high angular resolution is needed, which can achieved by changing the direction of the beam of incident electrons and photons using a tunable photon detector.

Illustrations

а — Inverse photoemission process; b — isochromatic spectrum schematic; c — deceleration radiatio

а — Inverse photoemission process; b — isochromatic spectrum schematic; c — deceleration radiation spectrum schematic [1].


Authors

  • Zotov Andrey V.
  • Saranin Alexander A.

Source

  1. Oura K. et al. Surface Science: An Introduction // Springer, 2010. - 452 pp.

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