Time-resolved imaging of bound and dissociating nuclear wave packets in strong-field ionized iodomethane

Malakar, Y.; Pearson, W. L.; Zohrabi, M.; Kaderiya, B.; P., Kanaka Raju; Ziaee, F.; Xue, S.; Le, A. T.; Ben-Itzhak, I.; Rolles, D.; Rudenko, A.

doi:10.1039/c8cp07032f

Time-resolved imaging of bound and dissociating nuclear wave packets in strong-field ionized iodomethane

Journal Article · Wed Jan 16 00:00:00 EST 2019 · Physical Chemistry Chemical Physics. PCCP

DOI:https://doi.org/10.1039/c8cp07032f· OSTI ID:1610699

Malakar, Y. ^[1]; Pearson, W. L. ^[2]; Zohrabi, M. ^[2]; Kaderiya, B. ^[2]; P., Kanaka Raju ^[2]; Ziaee, F. ^[2]; Xue, S. ^[3]; ^[4]; Ben-Itzhak, I. ^[2]; ^[2]; Rudenko, A. ^[2]

Kansas State Univ., Manhattan, KS (United States); DOE/OSTI
Kansas State Univ., Manhattan, KS (United States)
Kansas State Univ., Manhattan, KS (United States); Lanzhou Univ. (China)
Kansas State Univ., Manhattan, KS (United States); Missouri Univ. of Science and Technology, Rolla, MO (United States)

Here, we report the results of a time-resolved coincident ion momentum imaging experiment probing nuclear wave packet dynamics in the strong-field ionization and dissociation of iodomethane (CH₃I), a prototypical polyatomic system for photochemistry and ultrafast laser science. By measuring yields, kinetic energies, and angular distributions of CH₃⁺ + I⁺ and CH₃⁺ + I⁺⁺ ion pairs as a function of the delay between two 25 fs, 790 nm pump and probe pulses, we map both, bound and dissociating nuclear wave packets in intermediate cationic states, thereby tracking different ionization and dissociation pathways. In both channels, we find oscillatory features with a 130 fs periodicity resulting from vibrational motion (C–I symmetric stretch mode) in the first electronically excited state of CH₃I⁺. This vibrational wave packet dephases within 1 ps, in good agreement with a simple wave packet propagation model. Our results indicate that the first excited cationic state plays a key role in the dissociative ionization of CH₃I and that it represents an important intermediate in the sequential double and multiple ionization at moderate intensities.

View Accepted Manuscript (DOE)

Research Organization:: Kansas State Univ., Manhattan, KS (United States)

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

Grant/Contract Number:: FG02-86ER13491; SC0002378

OSTI ID:: 1610699

Alternate ID(s):: OSTI ID: 1492479

Journal Information:: Physical Chemistry Chemical Physics. PCCP, Journal Name: Physical Chemistry Chemical Physics. PCCP Journal Issue: 26 Vol. 21; ISSN 1463-9076; ISSN PPCPFQ

Publisher:: Royal Society of ChemistryCopyright Statement

Country of Publication:: United States

Language:: English

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chemistry
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Time-resolved imaging of bound and dissociating nuclear wave packets in strong-field ionized iodomethane

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