Premium
CARS studies of H 2 O motional narrowing in high‐pressure and high‐temperature H 2 ON 2 mixtures
Author(s) -
Grisch F.,
Pealat M.
Publication year - 1994
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/jrs.1250250203
Subject(s) - motional narrowing , chemistry , spectral line , relaxation (psychology) , atmospheric temperature range , angular momentum , line (geometry) , rotational temperature , rotational energy , analytical chemistry (journal) , thermodynamics , atomic physics , physics , classical mechanics , psychology , social psychology , geometry , mathematics , astronomy , chromatography
CARS spectra of the ν 1 band of water vapour at room temperature and 2100 K over a large pressure range (200–19 × 10 5 Pa) were studied experimentally and theoretically. The influence of N 2 and H 2 O on the rotational relaxation processes of H 2 O in H 2 ON 2 mixtures was investigated. Modelling of the CARS spectrum was performed using the relaxation matrix inversion procedure. Two rotational relaxation models based on energy and angular momentum transfer were tested and good agreement between experiment and theory was found for all the conditions studied. At 19 × 10 5 Pa and 2100 K, motional narrowing was found to be weak, allowing calculation of the CARS spectrum with the simple isolated‐line model.