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Detection of metastable excited molecules N 2 (A 3 Σu + ) in an atmospheric pressure nitrogen discharge by Raman scattering
Author(s) -
Fukuchi Tetsuo
Publication year - 2010
Publication title -
electronics and communications in japan
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.131
H-Index - 13
eISSN - 1942-9541
pISSN - 1942-9533
DOI - 10.1002/ecj.10205
Subject(s) - raman scattering , rayleigh scattering , excited state , raman spectroscopy , laser , wavelength , nitrogen laser , photomultiplier , atomic physics , metastability , scattering , analytical chemistry (journal) , optics , materials science , chemistry , physics , organic chemistry , chromatography , detector
Raman scattering from metastable excited nitrogen molecules N 2 (A 3 Σu + ) created by an impulse discharge in nitrogen at atmospheric pressure was detected. A pulsed Nd:YAG laser at a wavelength of 266 nm was used as the light source, and Raman scattering from N 2 (A 3 Σu + ) at a wavelength of 277 nm was detected using an interference filter and photomultiplier tube. The filter had sufficient rejection of Rayleigh scattering of laser light at a wavelength of 266 nm and of Raman scattering from ground‐state nitrogen molecules N 2 (X 1 Σg + ) at a wavelength of 284 nm. The temporal variation of the signal intensity of Raman scattering from N 2 (A 3 Σu + ) was measured by transmitting the laser light at different time delays relative to sparkover. The results showed that the signal intensity decayed with a time constant of about 200µs. © 2010 Wiley Periodicals, Inc. Electron Comm Jpn, 93(6): 34–40, 2010; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/ecj.10205