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Issue 28, 2019
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Femtosecond predissociation dynamics of ethyl iodide in the B-band

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Femtosecond time-resolved velocity map ion imaging experiments are reported on the second absorption band (B-band) of ethyl iodide at 201.19 and 200.08 nm, corresponding to the 000 and 1810 transitions, i.e., the origin of the band and the first most intense vibronic state assigned to one quantum of excitation in the methyl torsion mode. Electronic predissociation lifetimes and the temporal evolution of the anisotropy have been determined by time-resolved resonance-enhanced multiphoton ionization of iodine and ethyl fragment images. A shorter lifetime measured at the origin of the band in comparison with methyl iodide indicates that predissociation in ethyl iodide is more favorable due to a stronger coupling between the initial Rydberg state and the valence repulsive state correlating with the dissociation fragments. Moreover, vibrational activity in the methyl torsion in the Rydberg state seems to enhance the probability of transfer of population to the valence repulsive state leading to a faster dissociation. The perpendicular character of the transition at early times and the loss of anisotropy as a function of time have been determined from the time-resolved angular distributions of the iodine and ethyl ion images. The initial anisotropy value is consistent with a purely perpendicular transition compatible with the excitation of the [6A′′, 7A′] states with a minor parallel component to the C–I bond. The loss of initial anisotropy over time highlights the parent molecular rotation during predissociation and is compatible with a rotational temperature of the parent molecule of 100 K.

Graphical abstract: Femtosecond predissociation dynamics of ethyl iodide in the B-band

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Article information

27 May 2019
24 Jun 2019
First published
26 Jun 2019

Phys. Chem. Chem. Phys., 2019,21, 15695-15704
Article type

Femtosecond predissociation dynamics of ethyl iodide in the B-band

M. L. Murillo-Sánchez, S. Marggi Poullain, V. Loriot, M. E. Corrales and L. Bañares, Phys. Chem. Chem. Phys., 2019, 21, 15695
DOI: 10.1039/C9CP02992C

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