The first observation of level-crossing resonances in ortho-para conversion is presented. A sharp increase in the conversion rate of gaseous ¹³CH₃F is observed when an applied electric field produces crossing of molecular ortho and para levels. The experimental results are described well by the spin conversion theory based on intramolecular ortho-para state mixing. The results provide direct identification of the levels being mixed and the interaction responsible. The observed spectrum may be considered as an example of Doppler-free spectroscopy.
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Nagels et al. (1996) studied this question.
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