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High‐resolution stimulated Raman study of the first vibrational hot band of 14 N 2 . Separate observation of the spectra of the ortho and para species.
Author(s) -
Martínez R. Z.,
Bermejo D.
Publication year - 2013
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.4245
Subject(s) - raman spectroscopy , chemistry , spectral line , analytical chemistry (journal) , population , hot band , resolution (logic) , atomic physics , spectral resolution , nuclear magnetic resonance , molecular physics , molecular vibration , physics , optics , demography , chromatography , astronomy , artificial intelligence , sociology , computer science
We present high‐resolution stimulated Raman spectra of the first hot band of nitrogen, 14 N 2 , obtained under conditions of low sample pressure and temperature. The use of a Raman optical pumping system allowed us to transfer a significant amount of population to the v = 1 vibrational state, which made possible the observation of the aforementioned hot band with good S/N ratio without resorting to the use of high temperatures or pressures. This has resulted in a more precise and accurate determination of the peak positions than previously existing ones, which in turn has yielded improved values for the molecular constants obtained from the analysis. The rotational selectivity of the pumping process (only one rotational state is initially populated in v = 1), coupled with the negligible probability of nuclear spin interconversion in the time frame of the experiment, has allowed us to observe the hot band spectra of the ortho and para species of 14 N 2 separately. Copyright © 2013 John Wiley & Sons, Ltd.