Photos induced desorption and intercalation of potassium atoms deposited on graphite(0001)

被引：6

作者：

Chakarov, DV ^{[1
]}

Osterlund, L ^{[1
]}

Hellsing, B ^{[1
]}

Kasemo, B ^{[1
]}

机构：

[1] GOTHENBURG UNIV,S-41296 GOTHENBURG,SWEDEN

来源：

APPLIED SURFACE SCIENCE | 1996年 / 106卷

基金：

瑞典研究理事会;

关键词：

D O I：

10.1016/S0169-4332(96)00410-2

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

In addition to the photodesorption phenomenon previously observed for single K atoms from a graphite surface covered with a monolayer of potassium we present new results related to the photon stimulated interaction of potassium with graphite, which concerns alternative routes for energy relaxation of the photo excited K adatoms: photoinduced intercalation. The desorption yield has a threshold at h omega approximate to 3 eV and a maximum at h omega(max) approximate to 4.9 eV, Polarization measurements indicate a substrate-mediated mechanism. The coverage dependence suggests that only the ionic 2D, K-phase is photo active. The proposed mechanism includes attachment of photo-generated hot electrons to the K 4s adsorbate resonance of energy E(res). Assuming an analogous excitation process we discuss different mechanisms for the K photo intercalation and possible applications of the photon stimulated doping of carboneous materials at low temperature.

引用

页码：186 / 192

页数：7

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