Single- and multi-photon-induced ultraviolet excitation and photodissociation of CH3I probed by coincident ion momentum imaging
Abstract
The UV-induced photodissociation dynamics of iodomethane (CH3I) in its A-band are investigated by time-resolved coincident ion momentum imaging using strong-field ionization as a probe. The delay-dependent kinetic energy distribution of the photofragments resulting from double ionization of the molecule maps the cleavage of the carbon–iodine bond and shows how the existence of a potential well in the di-cationic potential energy surfaces shapes the observed distribution at small pump–probe delays. Furthermore, the competition between single- and multi-photon excitation and ionization of the molecule is studied as a function of the intensity of the UV-pump laser pulse. Two-photon excitation to Rydberg states is identified by tracking the transformation of the delay-dependent singly-charged iodomethane yield from a pure Gaussian distribution at low intensity to a Gaussian with an exponentially decaying tail at higher intensities. In conclusion, dissociative ionization induced by absorption of three UV photons is resolved as an additional delay-dependent feature in the kinetic energy of the fragment ions detected in coincidence.
- Authors:
-
[1];
[2];
[3];
[1];
[1];
[1]
- Kansas State Univ., Manhattan, KS (United States)
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)
- Kansas State Univ., Manhattan, KS (United States); School of Quantum Technology, Pune (India)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). Linac Coherent Light Source (LCLS)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences & Biosciences Division (CSGB); USDOE
- OSTI Identifier:
- 2006863
- Alternate Identifier(s):
- OSTI ID: 1963331
- Grant/Contract Number:
- AC02-76SF00515; FG02-86ER13491
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Chemistry Chemical Physics. PCCP
- Additional Journal Information:
- Journal Volume: 25; Journal Issue: 14; 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; UV-induced photodissociation; strong-field ionization; Coulomb explosion imaging; coincident ion momentum imaging; femtosecond dynamics
Citation Formats
Ziaee, Farzaneh, Borne, Kurtis, Forbes, Ruaridh, P., Kanaka Raju, Malakar, Yubaraj, Kaderiya, Balram, Severt, Travis, Ben-Itzhak, Itzik, Rudenko, Artem, and Rolles, Daniel. Single- and multi-photon-induced ultraviolet excitation and photodissociation of CH3I probed by coincident ion momentum imaging. United States: N. p., 2023.
Web. doi:10.1039/d3cp00498h.
Ziaee, Farzaneh, Borne, Kurtis, Forbes, Ruaridh, P., Kanaka Raju, Malakar, Yubaraj, Kaderiya, Balram, Severt, Travis, Ben-Itzhak, Itzik, Rudenko, Artem, & Rolles, Daniel. Single- and multi-photon-induced ultraviolet excitation and photodissociation of CH3I probed by coincident ion momentum imaging. United States. https://doi.org/10.1039/d3cp00498h
Ziaee, Farzaneh, Borne, Kurtis, Forbes, Ruaridh, P., Kanaka Raju, Malakar, Yubaraj, Kaderiya, Balram, Severt, Travis, Ben-Itzhak, Itzik, Rudenko, Artem, and Rolles, Daniel. Thu .
"Single- and multi-photon-induced ultraviolet excitation and photodissociation of CH3I probed by coincident ion momentum imaging". United States. https://doi.org/10.1039/d3cp00498h. https://www.osti.gov/servlets/purl/2006863.
@article{osti_2006863,
title = {Single- and multi-photon-induced ultraviolet excitation and photodissociation of CH3I probed by coincident ion momentum imaging},
author = {Ziaee, Farzaneh and Borne, Kurtis and Forbes, Ruaridh and P., Kanaka Raju and Malakar, Yubaraj and Kaderiya, Balram and Severt, Travis and Ben-Itzhak, Itzik and Rudenko, Artem and Rolles, Daniel},
abstractNote = {The UV-induced photodissociation dynamics of iodomethane (CH3I) in its A-band are investigated by time-resolved coincident ion momentum imaging using strong-field ionization as a probe. The delay-dependent kinetic energy distribution of the photofragments resulting from double ionization of the molecule maps the cleavage of the carbon–iodine bond and shows how the existence of a potential well in the di-cationic potential energy surfaces shapes the observed distribution at small pump–probe delays. Furthermore, the competition between single- and multi-photon excitation and ionization of the molecule is studied as a function of the intensity of the UV-pump laser pulse. Two-photon excitation to Rydberg states is identified by tracking the transformation of the delay-dependent singly-charged iodomethane yield from a pure Gaussian distribution at low intensity to a Gaussian with an exponentially decaying tail at higher intensities. In conclusion, dissociative ionization induced by absorption of three UV photons is resolved as an additional delay-dependent feature in the kinetic energy of the fragment ions detected in coincidence.},
doi = {10.1039/d3cp00498h},
journal = {Physical Chemistry Chemical Physics. PCCP},
number = 14,
volume = 25,
place = {United States},
year = {Thu Mar 16 00:00:00 EDT 2023},
month = {Thu Mar 16 00:00:00 EDT 2023}
}
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