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A theoretical analysis of nuclear-spin conversion in ethylene ¹³CCH₄ has been performed. The conversion rate was found to be 3×10^-4 s^-1/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 spin-rotation coupling. Mixing of only two pairs of ortho-para levels was found to contribute significantly to the spin conversion.
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Chapovsky et al. (2001) studied this question.
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