Journal
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
Volume 77, Issue 1, Pages 141-145Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.saa.2010.04.041
Keywords
Molecular spectroscopy; SO2 molecule; Time resolved emission spectrum; Phosphorescence spectrum
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Funding
- Natural Science Foundation of China [10647130]
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Laser induced fluorescence (LIF) emission spectrum of SO2 in the range of 270.0-470.0 nm has been obtained with the quadruple harmonic output (266 nm) of a pulsed Nd:YAG laser as excitation source. The spectrum is composed of a continuous envelope in the short wavelength side, while it shows the character of banded structure superimposed on a continuous one in the long wavelength region. Fluorescence emission from the hybrid states of A(1)A(2) + (BB1)-B-1 and X(1)A(1) + (BB1)-B-1 forms the continuous envelope and phosphorescence emission from the triplet state a(3)B(1) forms the banded progression. It is also found that direct emission from laser excited states is very weak. The primary portion of the emission is from the energy levels populated by collision relaxation or collision induced intersystem crossing process. The harmonic frequencies and inharmonic coefficients of the symmetric stretching vibration and the bending vibration of X(1)A(1) state are derived from the ascription of the phosphorescence progression. (c) 2010 Elsevier B.V. All rights reserved.
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