Studies of matrix-isolation spectra in solid hydrogen

Citation

Runyan, Charles C. (1972) Studies of matrix-isolation spectra in solid hydrogen. Master's thesis, California Institute of Technology. doi:10.7907/01VE-B736. https://resolver.caltech.edu/CaltechTHESIS:05072010-113436579

Abstract

Studies into the spectral features produced by atomic and molecular systems isolated in solid hydrogen have been undertaken to elucidate the nature of the interaction between the isolated species and the surrounding matrix. The absorption properties of matrix-isolated calcium are investigated to seek an understanding of the diffuse characteristics of absorption spectra perceived in stellar radiation that traverses interstellar dust clouds. The fine structural features of the A^1B_(2u) – X^1A(1g) transition of benzene isolated in hydrogen are examined for their bearing on the extremely sharp lines exhibited by benzene in all light matrices. The impure hydrogen samples are prepared for absorption investigations by depositing hydrogen and calcium or benzene onto a window cooled to 2°K. Besides the spectra of the above two systems isolated in hydrogen, the absorption signals of benzene in solid deuterium and of perdeuterobenzene in both solid hydrogen and solid deuterium are also presented. Furthermore, changes in the benzene fine structure that result from the reduction of the ortho/para ratio of the solid hydrogen medium are provided. Because these studies have not been carried to completion, extensive detail in experimental procedures is supplied and a brief analysis of the shifts and shapes of the observed absorption lines offers thoughts for further research.

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