THERMAL-DESORPTION FROM MASS-SPECTROMETER FILAMENTS

被引：2
|
作者：
BATEY, JH
机构：
[1] V G Quadrupoles, Middlewich, Cheshire CW10 OHS, Aston Way
来源：
VACUUM | 1992年 / 43卷 / 1-2期
关键词：
Gases - Desorption - Gases - Impurities - Mass Spectrometers - Ion Sources - Mass Spectrometry - Computer Applications;
D O I：
10.1016/0042-207X(92)90176-W
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
In most mass spectrometers of the Residual Gas Analyser (RGA) or Partial Pressure Analyser (PPA) type, the gaseous sample is ionised by electron impact, using electrons emitted from a filament heated to incandescence. The hot filament may emit significant quantities of gas. This is especially noticeable with a new filament. The amount of gas liberated can be reduced by 'pre-conditioning' the filament before it is installed. The pre-conditioning consists of heating the filament in a controlled manner. In some cases, this has been found essential in order to obtain reliable performance. A computer-controlled RGA has been used to monitor the gaseous species evolved when a filament is heated to its operating temperature. Correlations have been observed between the species evolved during this operation, other physical parameters and the subsequent performance of the filament.
引用
收藏
页码：15 / 19
页数：5
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