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Intense-Field Multiple-Detachment of F 2 ¯: Competition with Photodissociation.
Journal of Physical Chemistry. A 2017 April 28
The competition of intense-field multiple-detachment with efficient photodissociation of F2 ¯ is studied as a function of laser peak intensity. The main product channels are disentangled and characterized by 3D coincidence fragment imaging. The presented kinetic energy release spectra, angular distributions, as well as two-color pump-probe measurements allow identification of competing sequential and nonsequential mechanisms. Dissociative detachment, producing two neutral atoms (F + F), is found to be dominated by a sequential mechanism of photodissociation (F¯ + F), followed by detachment of the atomic anion fragment. In contrast, dissociative ionization (F + F+ ) shows competing contributions of both a sequential two-step mechanism as well as a nonsequential double-detachment of the molecular anion, which are distinguished by the kinetic energy released in the dissociation. Triple-detachment is found to be nonsequential in nature and results in Coulomb explosion (F+ + F+ ). Furthermore, the measured kinetic energy release for dissociation on the2 Σg + state provides a direct measurement of the F2 ¯ dissociation energy, D0 = 1.26 ± 0.03 eV.
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