| The studies of the spectra and structures of free radicals are of great significance for Cosmos evolvement, Chemical reaction, Biomedicine. From the analysis of spectra of free radicals in external field, such as magnetic and electric field, we can deduce some important parameters and information on Zeeman and Stark effects of the interesting species. In this thesis, two main parts are included, the first focuses on the characteristics of high-resolution spectra of free radicals in magnetic field, the second concentrates on the measurement of electric dipole moment of free radicals by Zeeman and Stark effects simultaneously.With the high sensitivity and high resolution of the CO intracavity Laser Magnetic Resonance (LMR) spectrometer, the high-resolution spectra of the rare isotope molecule 15N16O in natural abundance were successfully observed, which provided experimentai data for the analysis of the hyperfine structure of NO molecule. According to the theories of Zeeman effect and the principle of LMR, we developed a very simple and effective approach to analyze the characteristics of Zeeman effect in LMR spectra of free radicals in 2Î state without resorting to the matrix diagonalization of precise molecular Hamiltonian, and successfully employed it to explain the non-linear Zeeman effect of NO in moderate magnetic field strength. To obtain the hyperfine structure and A-doubling parameters from the high-resolution spectra of novel free radicals directly, a set of algebraic formulae were developed to analyze the spectra with hyperfine structure and A-doubling resolution, some related important constants of NO have been obtained by analyzing its LMR spectra. By introducing an isotopic scale function into the precise molecular Hamiltonian, we made a globe fit of most of the spectral lines of 15N16O in different spectroscopic region then obtained the most complete and precise molecular parameters so far.
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