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.
Ziaee, Farzaneh, et al. "Single- and multi-photon-induced ultraviolet excitation and photodissociation of CH<sub>3</sub>I probed by coincident ion momentum imaging." Physical Chemistry Chemical Physics. PCCP, vol. 25, no. 14, Mar. 2023. https://doi.org/10.1039/d3cp00498h
Ziaee, Farzaneh, Borne, Kurtis, Forbes, Ruaridh, et al., "Single- and multi-photon-induced ultraviolet excitation and photodissociation of CH<sub>3</sub>I probed by coincident ion momentum imaging," Physical Chemistry Chemical Physics. PCCP 25, no. 14 (2023), https://doi.org/10.1039/d3cp00498h
@article{osti_2006863,
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},
title = {Single- and multi-photon-induced ultraviolet excitation and photodissociation of CH<sub>3</sub>I probed by coincident ion momentum imaging},
annote = {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},
url = {https://www.osti.gov/biblio/2006863},
journal = {Physical Chemistry Chemical Physics. PCCP},
issn = {ISSN 1463-9076},
number = {14},
volume = {25},
place = {United States},
publisher = {Royal Society of Chemistry},
year = {2023},
month = {03}}
Poullain, Sonia Marggi; Chicharro, David V.; Rubio-Lago, Luis
Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, Vol. 375, Issue 2092https://doi.org/10.1098/rsta.2016.0205