Tracking dissociation dynamics of strong-field ionized 1,2-dibromoethane with femtosecond XUV transient absorption spectroscopy

Chatterley, Adam S.; Lackner, Florian; Neumark, Daniel M.; Leone, Stephen R.; Gessner, Oliver

doi:10.1039/c6cp02598f

Tracking dissociation dynamics of strong-field ionized 1,2-dibromoethane with femtosecond XUV transient absorption spectroscopy

Journal Article · Wed May 11 00:00:00 EDT 2016 · Physical Chemistry Chemical Physics. PCCP

DOI:https://doi.org/10.1039/c6cp02598f· OSTI ID:1439187

Chatterley, Adam S. ^[1]; Lackner, Florian ^[1]; Neumark, Daniel M. ^[1]; Leone, Stephen R. ^[2]; Gessner, Oliver ^[3]

Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Chemical Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Chemistry
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Chemical Sciences Division; Univ. of California, Berkeley, CA (United States). Dept. of Chemistry and Dept. of Physics
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Chemical Sciences Division

Using femtosecond time-resolved extreme ultraviolet absorption spectroscopy, the dissociation dynamics of the haloalkane 1,2-dibromoethane (DBE) have been explored following strong field ionization by femtosecond near infrared pulses at intensities between 7.5 × 10¹³ and 2.2 × 10¹⁴ W cm^-2. The major elimination products are bromine atoms in charge states of 0, +1, and +2. The charge state distribution is strongly dependent on the incident NIR intensity. While the yield of neutral fragments is essentially constant for all measurements, charged fragment yields grow rapidly with increasing NIR intensities with the most pronounced effect observed for Br⁺⁺. However, the appearance times of all bromine fragments are independent of the incident field strength; these are found to be 320 fs, 70 fs, and 30 fs for Br˙, Br⁺, and Br⁺⁺, respectively. Transient molecular ion features assigned to DBE⁺ and DBE⁺⁺ are observed, with dynamics linked to the production of Br⁺ products. Neutral Br˙ atoms are produced on a timescale consistent with dissociation of DBE⁺ ions on a shallow potential energy surface. The appearance of Br⁺ ions by dissociative ionization is also seen, as evidenced by the simultaneous decay of a DBE⁺ ionic species. Dicationic Br⁺⁺ products emerge within the instrument response time, presumably from Coulomb explosion of triply charged DBE.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: Austrian Science Fund (FWF); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1439187

Journal Information:: Physical Chemistry Chemical Physics. PCCP, Journal Name: Physical Chemistry Chemical Physics. PCCP Journal Issue: 21 Vol. 18; ISSN 1463-9076; ISSN PPCPFQ

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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