Calibration method for the quantitative analysis of gas mixtures by means of multiphoton ionization mass spectrometry
作者:
U. Boesl,
C. Weickhardt,
S. Schmidt,
H. Nagel,
E. W. Schlag,
期刊:
Review of Scientific Instruments
(AIP Available online 1993)
卷期:
Volume 64,
issue 12
页码: 3482-3486
ISSN:0034-6748
年代: 1993
DOI:10.1063/1.1144272
出版商: AIP
数据来源: AIP
摘要:
A technique for quantitative analysis of gas mixtures in a laser mass spectrometer is presented. It is based on the addition of two calibration gases with different orders of multiphoton ionization process to the sample gas. The ratio of the signals of these two internal standards serves as a sensor for the laser intensity within the ionization volume. Thus strongly fluctuating signals due to higher‐order multiphoton ionization can be normalized for every single laser shot. In addition, for such a relative measurement, effects of long‐term drifts of the apparatus are eliminated. Concentrations varying from a few ppm to several percent could be determined with an accuracy better than 10% at every single laser shot. Therefore this technique allows high time resolution.
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