Surface photochemical determination of the mean free path of subvacuum electrons in adsorbate films

Dissociative electron attachment (DEA) of adsorbates was used to detect photoexcited substrate electrons with energies below the vacuum level. When adsorbate layers of variable thickness were deposited on a Pt(111) surface and capped with a topmost, DEA active, detector layer of CH 3Br the mean free...

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Bibliographic Details
Published in:Surface science 1992-10, Vol.276 (1), p.325-332
Main Authors: Ukraintsev, V.A., Harrison, I.
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electronic structure and electrical properties of surfaces, interfaces, thin films and low-dimensional structures
Exact sciences and technology
Metals. Metallurgy
Physics
Surface and interface electron states
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Summary:Dissociative electron attachment (DEA) of adsorbates was used to detect photoexcited substrate electrons with energies below the vacuum level. When adsorbate layers of variable thickness were deposited on a Pt(111) surface and capped with a topmost, DEA active, detector layer of CH 3Br the mean free path of substrate derived electrons could be measured. The averaged electron scattering cross section through solid Xe at 25 K was σ s = 4.7 +0.7 −0 A ̊ 2 for electrons of energy −0.6 ⩽ E v ⩽ −0.27 eV with respect to the vacuum level. The cross section in solid CH 3Br at 25 K was σ s ⩾ 4.7 A ̊ 2 averaged over an approximately 0.4 eV FWHM range of electron energies centred at E v = −0.7 eV.
ISSN:0039-6028
1879-2758
DOI:10.1016/0039-6028(92)90719-M