On the relative importance of spin–spin and spin–rotation relaxation in gas phase NMR

Publisher Website
Google Scholar
Abstract
The ratio R of the gas phase spin–spin and spin–rotation relaxation times TSS1 and TSR1 is examined in detail using the factorization of infinite order sudden (IOS) approximation generalized cross sections given recently by Goldflam, Green, and Kouri. General results are obtained in the extreme narrowing limit for both homonuclear and heteronuclear systems. The results are quite simple and, in the low temperature limit, depend primarily upon the characteristics of the relaxing nucleus rather than the intermolecular interaction. Calculations illustrating the theory are presented for He+o‐H2.