The second moments of molecular-beam nuclear resonance curves are compared through a simple motionnarrowing theory with linewidths from gas-phase NMR data for CF4, SiF4, SF6, CH3F, CF3H, and CH2F2 at 300°K. From this comparison the average number of collisions necessary for these molecules to change their angular momentum is estimated to be on the order of three.
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Crapo et al. (1965) studied this question.
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