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• W2092508088 abstract "We present a summary of our results on methyl group spectroscopy and relaxation measurements of the dye molecule dimethyl-s-tetrazine and its CD3- and CDH2-substituted derivatives in a n-octane host. In the CH3- and CD3-substituted derivatives, two hole burning mechanisms occur: one is based on nuclear spin-transformation, the other is a structural transformation. The mechanism based on spin transformation leads to sharp antiholes, spaced by 37 and 20 GHz from the burning laser frequency for CH3 and CD3, respectively. The structural burning mechanism leads to side holes. Surprisingly, the splitting of the side holes is different from that of the antiholes. This phenomenon is interpreted in terms of two different dye species, which are distinguished through their local environment. Both species have very different yields for the structural and the nuclear spin phototransformation process. From the recovery of the central hole, the relaxation of the rotational tunneling states was measured as a function of temperature. The data support a Raman-type phonon scattering process. Deuteration does not slow down the relaxation but, instead, increases it by almost two orders of magnitude. According to our knowledge these are the first measurements of symmetry species conversion times of isotopic derivatives of methyl groups. Within the assumption of a Raman-type conversion mechanism we estimate a rather low hindering potential barrier for the rotors." @default.
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• W2092508088 date "1993-10-01" @default.
• W2092508088 modified "2023-09-25" @default.
• W2092508088 title "Symmetry species conversion in rotational tunneling systems observed by hole burning: high resolution spectroscopy of dimethyl-s-tetrazine in n-octane" @default.
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• W2092508088 doi "https://doi.org/10.1016/0022-2313(93)90060-z" @default.
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