In this thesis, spectroscopic studies of the catalyzed nuclear spin conversion (NSC) of ortho-H2 molecules in solid H2 matrix and the high-resolution Fourier transform infrared (FTIR) absorption spectra of O2 and NO embedded in matrices of para-H2 crystals are presented. For NSC of ortho -H2, the catalyzed conversion rate was found to be diffusion-determined by setting up systematical kinetic studies of solid H2 samples dopant with O2 and NO. The factors affecting diffusion process were discussed; For the high-resolution FTIR of O2 and NO, sharp lines presumable due to rotational structure were observed. Based on the observation, preliminary analysis of the spectrum was discussed for O2 and NO, respectively. / Yan, Lei. / Adviser: Man-Chor Chan. / Source: Dissertation Abstracts International, Volume: 73-06, Section: B, page: . / Thesis (Ph.D.)--Chinese University of Hong Kong, 2011. / Includes bibliographical references (leaves 84-87). / Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [201-] System requirements: Adobe Acrobat Reader. Available via World Wide Web. / Abstract also in Chinese.

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