Intense-Field Multiple-Detachment of F2: Competition with Photodissociation

Abhishek Shahi, Yishai Albeck, Daniel Strasser*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

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 the 2Σg+ state provides a direct measurement of the F2 dissociation energy, D0 = 1.26 ± 0.03 eV.

Original languageAmerican English
Pages (from-to)3037-3044
Number of pages8
JournalJournal of Physical Chemistry A
Volume121
Issue number16
DOIs
StatePublished - 27 Apr 2017

Bibliographical note

Publisher Copyright:
© 2017 American Chemical Society.

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