NO kinetics in pulsed low-pressure plasmas studied by time-resolved quantum cascade laser absorption spectroscopy

• Type: Article in International Scientific Journal
• Date: 2011

Authors

Welzel, S (Author) Other; Guaitella, O (Author) Other; Lazzaroni, C (Author) Other; Carlos Daniel Diogo Matias Pintassilgo (Author) FEUP; Rousseau, A (Author) Other; Roepcke, J (Author) Other

Journal

Title: PLASMA SOURCES SCIENCE & TECHNOLOGY

Vol. 20 No. 024007 (12pp)

Final page: 015020

Publisher: IOP Publishing

Indexing

ISI Web of Knowledge - 11 Citations

Scopus - 9 Citations

Other information

Authenticus ID: P-002-VF8

DOI: 10.1088/0963-0252/20/1/015020

Abstract (EN): Time-resolved quantum cascade laser absorption spectroscopy at 1897 cm(-1) (5.27 mu m) has been applied to study the NO(X) kinetics on the micro-and millisecond time scale in pulsed low-pressure N(2)/NO dc discharges. Experiments have been performed under flowing and static gas conditions to infer the gas temperature increase and the consequences for the NO line strength. A relatively small increase of similar to 20 K is observed during the early plasma phase of a few milliseconds. After some 10 ms gas temperatures up to 500 K can be deduced. The experimental data for the NO mixing ratio were compared with the results from a recently developed time-dependent model for pulsed N(2)-O(2) plasmas which are well in accord. The early plasma pulse is determined by vibrational heating of N(2) while the excitation of NO(X) by N(2) metastables is almost completely balanced. Efficient NO depletion occurs after several milliseconds by N atom impact.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10