摘要
采用高分辨率光栅单色仪测量SO2气体在200-230和275～315nm波长范围内紫外吸收截面随温度的变化．离散吸收截面峰值与从基态迁移到激发态的量子数目直接相关．随着温度的升高，基态剩余量子旋转、振动迁移到激发态的几率减小，导致离散吸收截面峰值降低．随着温度由298K升高至415K，上述2个波段的离散吸收截面峰值的最大降低幅度分别为74．0％和75．8％，且整体上呈现线性减小的趋势．SO2在这2个波段的吸收截面均存在明显的等波长间隔分布特征，波长间隔分别为1．53和1．95nm．随着温度升高，峰值位置未见红移或蓝移．
The photoabsorption cross-sections of sulfur dioxide were measured in spectral regions of 200- 230 and 275-315 nm at 298-415 K by using a grating monochomator with resolution of 0.2 nm. Discrete absorption cross-section is directly correlated with the number of quantum excitated from base state. The absorption cross-sections at the peaks of discrete bands decreased linearly with increase in temperature, which corresponded to the decrease of population of vibrational and rotational transitions from base level to higher excitation levels. The absorption cross-section peaks decreased linearly when temperature increased from 298 K to 415 K, with relative drops of 74.0% and 75.8% at 200-230 and 275-315 nm respectively. Another distinctive feature for sulfur dioxide absorption spectra in the above two spectral regions was the quasiperiodic structure of absorption peaks, with equal wavelength intervals of 1.53 and 1.95 nm respectively. Red and blue shifts were not found at absorption peak positions.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2007年第2期329-332,共4页
Journal of Zhejiang University：Engineering Science
基金
国家自然科学基金资助项目(50376058)
关键词
紫外吸收
吸收截面
温度
二氧化硫
ultraviolet absorption
absorption cross-section
temperature
sulfur dioxide
