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Resonance Raman scattering from isotopically pure and natural bromine vapor
Author(s) -
Baierl P.,
Kiefer W.
Publication year - 1975
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.1250030406
Subject(s) - raman spectroscopy , chemistry , spectral line , resonance (particle physics) , bromine , raman scattering , analytical chemistry (journal) , molecule , atomic physics , optics , physics , organic chemistry , chromatography , astronomy
We have recorded high‐resolution resonance Raman spectra of the bromine molecule in its natural abundance and as pure isotopic molecules 79 Br 2 and 81 Br 2 with excitation by light which is in resonance with the continuum of the B ( 3 Π ou + )‐state. The observed spectra are characterized by a progression of vibrational lines up to the tenth harmonic. These lines display complex structure which can be explained in terms of Q branches, S band heads, unresolved O branches and vibrational ‘hot’ bands. The assignment of all observed lines is based on Fortrat diagrams which have been calculated by using spectroscopic constants derived from high resolution absorption spectra and on depolarization measurements. The vibrational constants ω e , ω e x e and ω e y e and the rotational constants B e and α e for the X ( 1 Σ g + )‐state of bromine were determined independently from the Raman spectra. Variations of the spectral band shape of the fundamental and the overtones were observed using five different exciting lines of the argon ion laser. The band shapes were also studied while changing the laser power which affects the spectroscopic temperature. A qualitative discussion of the observed changes is given.