Theory of nuclear spin conversion in ethylene
Abstract
First theoretical analysis of the nuclear spin conversion in ethylene molecules (13CCH4) has been performed. The conversion rate was found equal approx. 3x10-4 1/s*Torr, which is in qualitative agreement with the recently obtained experimental value. It was shown that the ortho-para mixing in 13CCH4 is dominated by the spin-rotation coupling. Mixing of only two pairs of ortho-para levels were found to contribute significantly to the spin conversion.
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