The photodissociation dynamics of CH3I and CH2ClI at 272 nm were investigated by time-resolved Coulomb explosion imaging, with an intense non-resonant 815 nm probe pulse. Fragment ion momenta over a wide m/z range were recorded simultaneously by coupling a velocity map imaging spectrometer with a pixel imaging mass spectrometry camera. For both molecules, delay-dependent pump-probe features were assigned to ultraviolet-induced carbon-iodine bond cleavage followed by Coulomb explosion. Multi-mass imaging also allowed the sequential cleavage of both carbon-halogen bonds in CH2ClI to be investigated. Furthermore, delay-dependent relative fragment momenta of a pair of ions were directly determined using recoil-frame covariance analysis. These results are complementary to conventional velocity map imaging experiments and demonstrate the application of time-resolved Coulomb explosion imaging to photoinduced real-time molecular motion.
Allum, Felix, et al. "Coulomb explosion imaging of CH<sub>3</sub>I and CH<sub>2</sub>ClI photodissociation dynamics." Journal of Chemical Physics, vol. 149, no. 20, Nov. 2018. https://doi.org/10.1063/1.5041381
@article{osti_1610037,
author = {Allum, Felix and Burt, Michael and Amini, Kasra and Boll, Rebecca and Köckert, Hansjochen and Olshin, Pavel K. and Bari, Sadia and Bomme, Cédric and Brauße, Felix and Cunha de Miranda, Barbara and others},
title = {Coulomb explosion imaging of CH<sub>3</sub>I and CH<sub>2</sub>ClI photodissociation dynamics},
annote = {The photodissociation dynamics of CH3I and CH2ClI at 272 nm were investigated by time-resolved Coulomb explosion imaging, with an intense non-resonant 815 nm probe pulse. Fragment ion momenta over a wide m/z range were recorded simultaneously by coupling a velocity map imaging spectrometer with a pixel imaging mass spectrometry camera. For both molecules, delay-dependent pump-probe features were assigned to ultraviolet-induced carbon-iodine bond cleavage followed by Coulomb explosion. Multi-mass imaging also allowed the sequential cleavage of both carbon-halogen bonds in CH2ClI to be investigated. Furthermore, delay-dependent relative fragment momenta of a pair of ions were directly determined using recoil-frame covariance analysis. These results are complementary to conventional velocity map imaging experiments and demonstrate the application of time-resolved Coulomb explosion imaging to photoinduced real-time molecular motion.},
doi = {10.1063/1.5041381},
url = {https://www.osti.gov/biblio/1610037},
journal = {Journal of Chemical Physics},
issn = {ISSN 0021-9606},
number = {20},
volume = {149},
place = {United States},
publisher = {American Institute of Physics (AIP)},
year = {2018},
month = {11}}
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Chemical Sciences, Geosciences & Biosciences Division; German Research Council (DFG); Swedish Research Council; Swedish Foundation for Strategic Research
Grant/Contract Number:
FG02-86ER13491
OSTI ID:
1610037
Journal Information:
Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 20 Vol. 149; ISSN 0021-9606
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