Pulsed technique for observing infrared emissions from ionic gas phase reactions at low reactant ion concentrations
| Autor: | Peter W. Harland, N. G. Adams, T. L. Williams, B. K. Decker, L. M. Babcock |
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| Rok vydání: | 2000 |
| Předmět: | |
| Zdroj: | Review of Scientific Instruments. 71:2169-2179 |
| ISSN: | 1089-7623 0034-6748 |
| DOI: | 10.1063/1.1150601 |
| Popis: | A technique has been developed to detect infrared emissions from the products of ionic reactions in plasmas. The technique employs dual-phase digital lock-in amplification and cold filtering to permit the detection of the weak infrared chemiluminescence (IRCL) with a solid-state detector. A novel method of cleanly modulating plasma chemiluminescence by the pulsed introduction of reagent gases has been developed and implemented. This new technique has been tested by studying the well-characterized H-atom reactions, H+Cl2→HCl(v=0–4)+Cl and H+NO2→OH(v=0–3)+NO. Rotational and vibrational distributions have been measured for these two reactions and are presented and compared with previous determinations. Additionally, the associative electron detachment reaction, H+Cl−→HCl(v=0–2)+e, has been studied, demonstrating that IRCL can be collected from reactions occurring at a low number density approaching that of the plasma ionization (∼4×1010 cm−3). The resolution, and hence, the information content of the collect... |
| Databáze: | OpenAIRE |
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