Long-Wavelength Photochemistry of Matrix-Isolated Biacetyl

Details Long-Wavelength Photochemistry of Matrix-Isolated Biacetyl Long-Wavelength Photochemistry of Matrix-Isolated Biacetyl

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mss..confetd10k&link_type=abstract

"International Symposium On Molecular Spectroscopy, 65th Meeting, Held 21-25 June, 2010 at Ohio State University. http://molspec

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Matrix/Condensed Phase

Scientific paper

Visible irradiation (520 nm>λ>485 nm) of matrix-isolated biacetyl (C_4H_6O_2) results in the formation of a complex of cis-methylhydroxycarbene (CH_3COH) and ketene (CH_2CO), as well as other products. The wavelengths used in this study are longer than those necessary for the S_0-S_1 (~X^1A_g -~A^1A_u) transition, indicating that the photolysis is the result of a multiphoton process. One such process is sequential, where the spin-forbidden S_0-T_1 (~X^1A_g -a˜^3A_u) transition is followed by the allowed T_1-T_2 (a˜^3A_u -b˜^3B_g) transition, with photoproducts emerging from the higher triplet (or following a radiationless transition to another state).
A simultaneous two-photon process is also possible through the symmetry-forbidden S_0-S_2 (~X^1A_g -Btilde^1B_g) transition. Photoproduct formation as a function of irradiation flux and wavelength was used to sort out the relative contributions of each of these processes.

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