| Sulfur monoxide cation (SO+) is one of the most important molecular ions in the world. It exists in the interstellar space and other celestial bodies, such as the plasma torus surrounding Jupiter in the orbit of Io and Halley comet. And it also exits in any kind of discharge containing the elements sulfur and oxygen. The spectral study, especially at high resolution, of SO+ is of great significance in scientific experiments and material analysis and testing.Optical heterodyne velocity modulation spectroscopy technique was employed to record rich absorption spectrum of SO+,which was produced by ac Penning discharging the flowing gas mixture of SO2 and helium. By studying the observed spectrum in the region of 12500-13000cm-1,rovibrational spectra in theb4∑--a4Πi and A2Πi-X2Πr systems of SO+ were tentatively assigned.About 267 spectral lines in the region of 12600-12800 cm-1 belonging to 13 branches of the (1, 0) band in the SO+ b4∑--a4Π5/2 transition were precisely analyzed for the first time. Therefore, near three orders precision improved molecular constants for both levels involved were determined by nonlinear least-squares procedure. In addition, 86 spectral lines belonging to the (2, 17) band in the A2Πi-X2Πr system of SO+ were tentatively analyzed.Furthermore, the RKR potential curves of both A2Πi and X2Πr states of SO+ were derived based on the latest equilibrium constants, and thus Franck-Condon factors and band origins were obtained. This will be helpful for the further spectral analysis.The thesis consists of five chapters. Chapter 1 introduces a brief history of SO+molecular ions. Chapter 2 gives a detailed description of the experimental system. Chapter 3 and 4 analyze the rovibational spectra of the (1,0) band in theb4∑--a4Π5/2 system and the (2,17) band in the A2Πi-X2Πr system of SO+,respectively. And chapter 5 makes a conclusion of this thesis and prospects the futureworks.
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