On Nuclear Magnetic Relaxation in Dilute Gases of Symmetric and Spherical Top Molecules

N u c l e a r m a g n e t i c re laxat ion in d i lute gases o f spher i ca l and s y m m e t r i c t op m o l e c u l e s is c o n s i d e r e d f r o m the po int of v iew of the k ine t i c theory o f transport and re laxat ion e q u a t ions b a s e d on the W a l d m a n n S n i d e r equat i on . T h e der ivat ion of the f o r m of the sp in-rotat ion H a m i l t o n i a n in the a b s e n c e o f c e n t r i f u g a l d is tor t ion is r e e x a m i n e d and an express i on f o r the " s p i n l a t t i c e " re laxat ion t ime is g iven f o r this case .