Experimental study on the temperature dependence of ultraviolet absorption cross-sections of sulfur dioxide |
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Authors: | Shiliang Zhang Jie Zhou and Xiaohu Chen |
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Affiliation: | (1) College of Mechanical and Energy Engineering, Zhejiang University, Hangzhou, 310027, China |
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Abstract: | The photoabsorption cross-sections of sulfur dioxide were measured in the spectral regions of 200–230 nm and 275–315 nm at
298–415 K, using a grating monochromator with a resolution of 0.2 nm. The discrete absorption cross-section is directly correlated
with the number of quantum excited from the base state. The absorption cross-sections at the peaks of discrete bands decreased
linearly with the increase of temperature, which corresponded to the decrease in the population of vibrational and rotational
transitions from the base level to higher excitation levels. The absorption cross-section peaks decreased linearly when the
temperature increased from 298 to 415 K, with relative drops of 74.0% and 75.8% at 200–230 nm and 275–315 nm, respectively.
Another distinctive feature of sulfur dioxide absorption spectra in the above two spectral regions was the quasiperiodic structure
of the absorption peaks, whose equal wavelength intervals were 1.53 nm and 1.95 nm, respectively. Red and blue shifts were
not found at the absorption peak positions.
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Translated from Journal of Zhejiang University (Engineering Science), 2007, 41(2): 329–332 译自: 浙江大学学报(工学版)] |
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Keywords: | ultraviolet absorption absorption cross-section temperature sulfur dioxide |
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