Abstract
AbstractWe report on the application of degenerate four‐wave mixing (DFWM) spectroscopy to the study of the temperature dependence of the 2B1(k″ = 0)–2A1(k′ = 1) Douglas–Huber band of NO2 up to 473 K. Measurements were performed in a static optical cell filled with pure samples at a pressure of 0.1 mbar. The possibility of selecting well‐isolated spectral features for thermometric application using the Boltzmann plot method (BPM) was investigated. Experimental data indicated that at T ≥ 393 K the use of BPM method has to be restricted to transitions with rotational quantum numbers N ≤ 15. Temperature predictions based on the BPM were compared with concurrent measurements performed with a thermocouple. Copyright © 2002 John Wiley & Sons, Ltd.
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