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- W1998647938 abstract "Abstract The spectroscopy and dynamics of selected vibronic bands of the S 1 (nπ * ) ← S 0 transition of acetone and acetone- d 6 were studied with single rotational-torsional-vibronic (rotorvibronic) level resolution in a jet up to an S 1 excess energy of 1300 cm −1 . Using clean coherent excitation with Fourier transform-limited nanosecond laser pulses quantum beats were observed in the time-resolved fluorescence and were attributed to coherently excited siglet-triplet eigenstates as identified by their magnetic properties. In the 8 1 23 0− and the 8 1 23 0+ I (2,1) state of acetone, and the 7 1 I (1,0) state of aceton- d 6 , lifetimes increase with the rotational quantum number of the excited state N due to a breakdown of K selection rules for the spin-orbit interaction in this very asymmetric rotor. In the 8 1 23 0− state, the rotorvibronic levels of the methyl torsion tunnelling component with G symmetry exhibit the longest lifetimes among the tunnelling components. Vibrational coupling of G torsional levels in the triplet manifold favoured by symmetry is proposed to selectively increase the density of coupling triplet states and, hence, the lifetime of the eigenstates." @default.
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- W1998647938 date "1994-08-01" @default.
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- W1998647938 title "Dynamics of S1 acetone studied with single rotorvibronic level resolution" @default.
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- W1998647938 doi "https://doi.org/10.1016/0301-0104(94)00148-0" @default.
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