Rydberg Photochemistry Photolysis of Methane

Having concluded on qualitative grounds that Si of naphthvalene can only be 2M1, the assignment was confirmed by computation. [43] Before the calculations were complete, a paper appeared by Gleiter et al. [47] in which the same assignment was established spectroscopically and confirmed using another computational method (CNDO-CI). 

An important family of chemical reactions occur after photoexcitation to molecular Rydberg states [48, 49, 50], a term borrowed from atomic spectroscopy. A concise definition is [4, p. 132] A Rydberg state is a state in which the spa- 

The two primary fragmentation modes of the excited methane molecule are  

In (A), the least-motion pathway has Czy symmetry, whereas (B) can retain no more than C2v It can be confirmed in the Table of Kernels and Co-kernels (Appendix B) that both of these subgroups of are co-kernels of T2, differing 

Formally, the spin-orbit coupling operator for one electron is proportional to + /ySy -I-p. 188] each term of which couples the orbital- and spin-angular momenta about one of the cartesian axes. The implication is that when z is the axis normal to an aromatic ring, Iz can be thought of as a momentary ring-current, and coupling with the corresponding spin factor Sz will make production of the Tz component particularly efficient. 

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