TY - JOUR

T1 - A microscopic theory of desorption induced by electronic transitions

AU - Kasai, Hideaki

AU - Okiji, Ayao

AU - Tsuchiura, Hiroki

PY - 1996/8/1

Y1 - 1996/8/1

N2 - Desorption induced by electronic transitions (DIET) in two cases is investigated from a microscopic point of view. In case A, where a single electron in a state of the localized kind (localized around adsorbates) is excited into a state of the extended kind (extended into the bosom of the substrate), the shape of the excited-state potential-energy surface (PES) may differ markedly from that of the ground-state PES for adsorbate motion. The Franck-Condon factor then takes a finite value, giving rise to a finite desorption probability. In case B, where a single electron in a state of the extended kind is excited into another state of the extended kind, the shape of the excited-state PES is practically the same as that of the ground-state PES. The Franck-Condon factor is then zero. In such a case, one should take DIET as a single-step (coherent) process and take into account the adsorbate-position dependence of the matrix element for state transitions of the electron system in order to obtain a finite desorption probability.

AB - Desorption induced by electronic transitions (DIET) in two cases is investigated from a microscopic point of view. In case A, where a single electron in a state of the localized kind (localized around adsorbates) is excited into a state of the extended kind (extended into the bosom of the substrate), the shape of the excited-state potential-energy surface (PES) may differ markedly from that of the ground-state PES for adsorbate motion. The Franck-Condon factor then takes a finite value, giving rise to a finite desorption probability. In case B, where a single electron in a state of the extended kind is excited into another state of the extended kind, the shape of the excited-state PES is practically the same as that of the ground-state PES. The Franck-Condon factor is then zero. In such a case, one should take DIET as a single-step (coherent) process and take into account the adsorbate-position dependence of the matrix element for state transitions of the electron system in order to obtain a finite desorption probability.

KW - Electron-stimulated desorption

KW - Photon-stimulated desorption

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U2 - 10.1016/0039-6028(96)00139-2

DO - 10.1016/0039-6028(96)00139-2

M3 - Article

AN - SCOPUS:0030206842

VL - 363

SP - 214

EP - 222

JO - Surface Science

JF - Surface Science

SN - 0039-6028

IS - 1-3

ER -