Laser induced fluorescence of CH2 (ã1A1) produced in the photodissociation of ketene at 337 nm. The CH2 (ã1A1-X̃3B1)energy separation |
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Authors: | J. Danon S.V. Filseth D. Feldmann H. Zacharias C.H. Dugan K.H. Welge |
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Affiliation: | Fakultät für Physik, Universität Bielefeld, 4800 Bielefeld 1, West Germany |
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Abstract: | The photodissociation of ketene, CH2CO(X?1A1) → CH2 (ã1A1) + CO(X 1Σ+) has been observed at 337 nm, using a pulsed nitrogen laser. The CH2 (ã 1A1) radical has been detected by laser induced fluorescence with a tunable dye laser. A laser excitation spectrum has been obtained from CH2(ã 1A1) over the wavelength interval from 588.9 to 595.6 nm in the Σ ← Π vibronic subband of the CH2 (ã 1A1); υ″ = 0, 0, 0?b? 1B1; υ′ = 0, 14, 0) transition. For the CH2(ã 1A1 ; υ′= 0, 0, 0?X? 3B1; υ′' = 0, 0, 0) energy separation an upper limit of (6.3 ± 0.8) kcal/mole has been found. The radiative lifetime τ and the rate constant k for the removal of the 000 rotational level of the Σ(0, 14, 0) vibronic state have been measured directly. The values are τ = (4.2 ± 0.2) μs and k = (7.4 ± 0.3) × 10?10 cm3 molecule?1 s?1, respectively. |
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