The spin relaxation time, T₁, has been measured at low densities
in normal H₂ at 77°K, 196°K, 298°K and 392°K as a function of density using a 96 mHz pulsed N.M.R. spectrometer and a T₁ minimum obtained. The data at 77°K, where only the J=1 rotational state is populated, is fit by the conventional theories, but the results at higher temperatures are not explained by the generalization of the Bloom-Oppenheim⁽⁶⁾ theory.
T₁ was also measured as a function of density for a mixture of 54.5% He in at 298°K in an effort to investigate the role of transitions between J states in the relaxation process.
The spin relaxation time T₁ was also measured in HD as a function
of density in the region of the T₁ minimum at 196°K and 298°K. Since the most recent theory has not been extended to a system of several populated J levels the results are rather inconclusive.
T₁ was also measured in CH₄ as a function of density in the region of the T₁ minimum at 196°K and 298°K and information about the rotational coupling constants obtained.
From these results it is concluded that measurements of T₁ as a function of density is very useful in testing theories of relaxation
and obtaining information on the rotational coupling constants for polyatomic molecules. / Science, Faculty of / Physics and Astronomy, Department of / Graduate
| Identifer | oai:union.ndltd.org:UBC/oai:circle.library.ubc.ca:2429/37756 |
| Date | January 1967 |
| Creators | Dorothy, Robert Glenn |
| Publisher | University of British Columbia |
| Source Sets | University of British Columbia |
| Language | English |
| Detected Language | English |
| Type | Text, Thesis/Dissertation |
| Rights | For non-commercial purposes only, such as research, private study and education. Additional conditions apply, see Terms of Use https://open.library.ubc.ca/terms_of_use. |
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