Laser photodissociation of s-tetrazine: Product vibrational excitation
1978; Elsevier BV; Volume: 32; Issue: 3 Linguagem: Inglês
10.1016/0301-0104(78)85024-1
ISSN1873-4421
AutoresDaniel R. Coulter, David A. Dows, H. Reisler, C. Wittig,
Tópico(s)Mass Spectrometry Techniques and Applications
ResumoAbstract The photosensitive and thermally unstable molecule s-tetrazine decomposes to yield one nitrogen molecule and two HCN molecules. Following pulsed irradiation of tetrazine vapor at 492.3 nm, we have observed time resolved infrared fluorescence from HCN(001). In a similar experiment, small quantities of CO 2 were added to the sample cell, and we observed infrared fluorescence from CO 2 (001) populated by VV energy transfer. From fluorescence intensity measurements, we have been able to estimate the amount of excitation in certain product vibrations. We conclude that ≈ 1% of the HCN is produced in the (001) state, and the “equivalent” of ≈ 0.1 quantum of N 2 vibrational excitation is excited. This latter figure may include some excitation of HCN (ν 1 ), but the measured energy transfer rate coefficients are consistent with N 2 excitation. The small amount of HCN(ν 3 ) and N 2 vibrational excitation is surprising, as the photodissociation is exothermic by more than 100kcal/mole.
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