| The study on S2 radical is of great significance both in the chemistry and interstellar physics fields. Most attentions have been paid to electronic transitions of S2, which are possibly potential source of chemical laser. What's more, its radiation and spectrum have been observed in the atmosphere and the collision flame of comets. There are unpaired electrons in S2, which induces their high reactive activity and reacts easily. In the chemical reactions, the states of the radials are usually be confirmed by the spectral information. The research on the spectrum of the radical lays the foundation of the whole chemistry studies on radicals. The sulfur-containing compound is one of the main contaminations in atmosphere. Lots of S2 are produced under the burning and discharged conditions, so the process of combustion can be monitored by observing the existed S2 radical in the blaze. Therefore, the study on the spectrum of S2 radical is also an active topic in the fields of atmospheric chemistry and combustion chemistry all along. The above are the reasons why we decided to carry out the study on the spectrum of S2 radical.This dissertation mainly presents the analyses and studies on the laser-induced fluorescence (LIF) excitation spectrum of S2.The laser-induced fluorescence excitation spectrum of jet-cooled S2 radicals in the range of 30000-35000cm-1has been observed. The S2 radicals were produced by a dc discharge of a mixture of SF6 and Ar with assistant copper electrodes under supersonic jet condition. Combined with previous studies, more than forty observed vibrational bands have been recorded and in which 28 bands have been assigned to(ν′=1-9,0),(ν′=1-8,1),(ν′=1-7,2)and(ν′=2-5,3) bands of the B3∑μ--X3∑g-...
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