Structure And Spectroscopy Of Free Radical NO And Molecular Ion CS～+

Free radicals and molecular ions play an important role in the study of interstellar medium, chemical reaction dynamics and medicines. This dissertation focused firstly on the measurement of mid-infrared laser magnetic resonance spectra of ¹⁴N¹⁶O,¹⁵N¹⁶O and their global analysis with the spectral data of all isotopomers ^mNⁿO(m=14,15; n= 16,17,18), and then on the velocity modulation laser electronic absorption spectroscopy of transient molecule CS⁺ and its deperturbation analysis.Nitric Oxide(NO), as one of the few stable free radicals, has always been of interest to physicists and chemists, and has been investigated both extensively and intensively. In the last decade, NO is attracted great attention again for its role as a signal transfer molecule in living bodies. Many studies have been accomplished by various kinds of spectroscopic techniques with some important molecular parameters determined. There are, however, no wide-accepted molecular parameters taken as a reference and no precise γ and A_D obtained simultaneously so far. In the first part of this dissertation, we reported the measurement of mid-infrared LMR spectra of N¹⁶O in natural abundance and results of a global analysis of our spectra together with all available published data of NO by introducing an isotopic scaling function. The least-squares fit of all data gives a full set of the most complete and precise molecular parameters of ^mNⁿO(m=14,15; n=16,17,18) series with the precision 1-2 orders higher than previous results. Many parameters are obtained for the first time. With these molecular parameters, we provide a mid-infrared frequency standard with deviations as small as 10^-5 - 10^-4cm^-1 in order from NIST spectral data.CS⁺ is an important probing molecular ion in the study of the formation, evolution and death of celestial bodies such as comet. CS has been detected in the atmosphere and celestial medium, but its cation CS⁺ has not been identified from...