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Photodissociation of Br 2 and the electronic Raman spectra of Br under argon ion laser light
Author(s) -
Chang Hua,
Chen ShuHui
Publication year - 1986
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.1250170605
Subject(s) - photodissociation , excited state , raman spectroscopy , chemistry , raman scattering , atomic physics , laser , argon , ion laser , excitation , dissociation (chemistry) , ion , population , photochemistry , optics , physics , demography , organic chemistry , quantum mechanics , sociology
The electronic Raman transitions of atomic bromine between the 2 P 1/2 and 2 P 3/2 states have been observed at 3685 cm −1 using excitation with 4880 Å radiation from an argon ion laser. The intensities of the Raman bands in the Stokes and anti‐Stokes sides were studied by varying the laser power and the pressure of Br 2 . A mechanism or photodissociation process for the production of these atoms by the intense laser radiation is proposed. The crossing between the potential curves of the B 3 π and 1 π states could be important in reducing the population of Br* in the 2 P 1/2 excited state, and therefore the intensity of the observed Raman band at the anti‐Stokes side was only about 1% of the intensity of the Stokes band. This would be a good method for studying photodissociation by means of Raman scattering from the dissociation products excited by the same laser radiation.