Abstract
We performed spectral hole burning experiments in the UV with p-chlorotoluene as a probe in cyclohexane. A method is presented which allows for the determination of the rotational tunneling splitting in S0 and S1. The respective values are (117±4) GHz (3.90±0.13) cm−1 and (84±4) GHz (2.80±0.13) cm−1. From these numbers the rotational barriers and the respective rotational eigenvalues can be determined. Based on these results the spin conversion dynamics is reinterpreted as being governed by Orbach processes.
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