Time-resolved imaging of bound and dissociating nuclear wave packets in strong-field ionized iodomethane
Abstract
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.
- Authors:
-
- 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)
- Publication Date:
- Research Org.:
- Kansas State Univ., Manhattan, KS (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division; USDOE
- OSTI Identifier:
- 1610699
- Alternate Identifier(s):
- OSTI ID: 1492479
- Grant/Contract Number:
- SC0002378; FG02-86ER13491
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Chemistry Chemical Physics. PCCP
- Additional Journal Information:
- Journal Volume: 21; Journal Issue: 26; Journal ID: ISSN 1463-9076
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; chemistry; physics; strong-field ionization; ultrafast lasers; coincident ion momentum imaging; Coulomb explosion; molecular dissociation
Citation Formats
Malakar, Y., Pearson, W. L., Zohrabi, M., Kaderiya, B., P., Kanaka Raju, Ziaee, F., Xue, S., Le, A. T., Ben-Itzhak, I., Rolles, D., and Rudenko, A. Time-resolved imaging of bound and dissociating nuclear wave packets in strong-field ionized iodomethane. United States: N. p., 2019.
Web. doi:10.1039/c8cp07032f.
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. Time-resolved imaging of bound and dissociating nuclear wave packets in strong-field ionized iodomethane. United States. https://doi.org/10.1039/c8cp07032f
Malakar, Y., Pearson, W. L., Zohrabi, M., Kaderiya, B., P., Kanaka Raju, Ziaee, F., Xue, S., Le, A. T., Ben-Itzhak, I., Rolles, D., and Rudenko, A. Wed .
"Time-resolved imaging of bound and dissociating nuclear wave packets in strong-field ionized iodomethane". United States. https://doi.org/10.1039/c8cp07032f. https://www.osti.gov/servlets/purl/1610699.
@article{osti_1610699,
title = {Time-resolved imaging of bound and dissociating nuclear wave packets in strong-field ionized iodomethane},
author = {Malakar, Y. and Pearson, W. L. and Zohrabi, M. and Kaderiya, B. and P., Kanaka Raju and Ziaee, F. and Xue, S. and Le, A. T. and Ben-Itzhak, I. and Rolles, D. and Rudenko, A.},
abstractNote = {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.},
doi = {10.1039/c8cp07032f},
journal = {Physical Chemistry Chemical Physics. PCCP},
number = 26,
volume = 21,
place = {United States},
year = {Wed Jan 16 00:00:00 EST 2019},
month = {Wed Jan 16 00:00:00 EST 2019}
}
Web of Science
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Works referencing / citing this record:
Ultrafast dissociative ionization and large-amplitude vibrational wave packet dynamics of strong-field-ionized di-iodomethane
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