Article ID Journal Published Year Pages File Type
5429523 Journal of Quantitative Spectroscopy and Radiative Transfer 2012 12 Pages PDF
Abstract

Gas phase photoabsorption studies of sulphur dioxide are carried out in the vacuum ultraviolet region using synchrotron radiation. Vibronic Analysis of the E˜−X˜ system lying in the region 1400-1600 Å is reported for the first time. A larger number of spectral features are resolved compared to earlier reports. While most of the observed bands can be arranged into four series with successive band spacing of 500-620 cm−1 in agreement with previous work, we observe two additional series with average separation of ∼1750 and ∼1000 cm−1. Results of the ab initio calculations suggest that at least three dominant excitations are involved in the E˜−X˜ system viz. X˜A11→3A11, X˜A11→2A21 and X˜A11→2B11. The observed vibrational features are found to be mainly due to excitation of the combination modes (ν1+ν2) and (ν2+ν3) with some contributions from ν1 and ν3. Details of the experiment and analysis are discussed in this paper.

► Photoabsorption spectra of SO2 (1400-1600 Å) using synchrotron radiation. ► Theoretical calculations on excited states of SO2 using the GAMESS code. ► Vibronic analysis of the E-X system using ab initio calculations. ► Possible excitations in the E˜−X˜ system dominated by X˜A11→3A11, X˜A11→2A21 and X˜A11→2B11. ► Observed features are due to excitation of (ν1+ν2), (ν2+ν3), ν1 and ν3.

Related Topics
Physical Sciences and Engineering Chemistry Spectroscopy
Authors
, , , , ,