THERMAL GRATING EFFECTS IN INFRARED DEGENERATE 4-WAVE-MIXING FOR TRACE GAS-DETECTION

被引：38

作者：

DREIZLER, A

DREIER, T

WOLFRUM, J

机构：

[1] Universität Heidelberg, Physikalisch-Chemisches Institut, D-69120 Heidelberg

来源：

CHEMICAL PHYSICS LETTERS | 1995年 / 233卷 / 5-6期

关键词：

D O I：

10.1016/0009-2614(94)01486-F

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：

Degenerate four-wave mixing (DFWM) in the infrared region using a single mode CO2 laser has been used for the detection of ethylene, sulfur hexafluoride and mixtures of these gases with nitrogen and argon in the pressure range up to one atmosphere. The investigations showed that for the low pressure regime (< 6.5 X 10(3) Pa) the formation of the DFWM signal was dominated by population gratings whereas for high pressures (> 25 X 10(3) Pa) mostly contributions from thermal gratings gave rise to the observed DFWM signal. This behaviour is reproduced by a simple model prediction for these relaxation processes.

引用

页码：525 / 532

页数：8

共 35 条

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