| 光谱学与光谱分析 |
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| Effects of Temperature on the Ultraviolet Absorption Characteristics of SO2 |
| ZHENG Hai-ming1, JIN Wei-jia2* |
1. Department of Mechanical Engineering，North China Electric Power University，Baoding 071000，China
2. Department of Electrical Engineering，North China Electric Power University，Baoding 071000，China |
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Abstract Absorption spectrum of SO2 is obtained under the condition of room temperature and atmosphere pressure. The spectrum is composed of banded structure superimposed on a continuum. The continuum structure comes from the transition of SO2 molecule from the ground electronic state to the higher dense rovibronic energy levels, and the banded one comes from the transition of B1B1←X1A1. The symmetric stretch and bend vibration frequencies are obtained from the banded structure. They are ω1=(665±29) cm-1 and ω2=(448±17) cm-1, respectively. Measuring the absorption spectra of SO2 at different temperature, it was also found that the configuration of the spectra is similar. But the absorption cross-section decreases with the increase in temperature. The absorption cross-section corresponding to the absorption peaks varies with temperature in the manner of cube. But the rate coefficients are different. So the effect of temperature on the measurement results must be considered when we use the technique of DOAS for the detection of SO2.
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Received: 2012-08-06
Accepted: 2012-11-18
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Corresponding Authors:
JIN Wei-jia
E-mail: gyzhang@ncepubd.edu.cn
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