SECONDARY-ION EMISSION FROM OXYGEN AND HYDROGEN-COVERED BERYLLIUM SURFACES .1. COVERAGE DEPENDENCE

被引：14

作者：

KRAUSS, AR

GRUEN, DM

机构：

[1] Chemistry Division, Argonne National Laboratory, Argonne

来源：

SURFACE SCIENCE | 1979年 / 90卷 / 02期

关键词：

D O I：

10.1016/0039-6028(79)90361-3

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：

Secondary ion emission from a beryllium surface is studied in the presence of hydrogen and oxygen. For submonolayer coverages of oxygen, the adsorption follows site-exclusion statistics. On this basis, the Be+ secondary ion yield and energy distribution can be separated into oxygen-dependent and oxygen-independent processes governed by the local properties of the surface. Ionic molecular species with hydrogen or oxygen present include Be2O+, Be2O-, BeO-, and BeH+ but not BeO+ or BeOH+. This result is inconsistent with emission in which the oxide molecule is formed in the near-surface vacuum region by agglomeration of individually sputtered surface atoms. For BeH+emission the opposite conclusion is reached. © 1979.

引用

页码：564 / 578

页数：15

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