Photodissociation processes of a water-oxygen complex cation studied by an ion imaging technique

Physical Chemistry Chemical Physics : PCCP
Yuji NakashimaFuminori Misaizu

Abstract

Photochemistry of molecular complex ions in the atmosphere affects the composition, density, and growth of chemical species. Photodissociation processes of a mass-selected O2+(H2O) complex ion in the visible and ultraviolet regions were studied by ion imaging experiments and theoretical calculations. At 473 nm excitation, O2+ was the predominant photofragment ion produced. In this O2+ channel, the kinetic energy release was comparable to that estimated using a statistical dissociation model, and the anisotropy parameter was determined to be β = 1.0 ± 0.1. On the other hand, the H2O+ photofragment ion was mainly produced at 355 nm excitation. The kinetic energy release for the H2O+ channel was large and nonstatistical, and the anisotropy parameter was β = 1.9 ± 0.2. Theoretically, the 473 and 355 nm excitations were assigned to the B[combining tilde]2A''← X[combining tilde]2A'' and D[combining tilde]2A''← X[combining tilde]2A'' transitions, respectively, both of which were characterized by positive charge transfer from O2 to H2O subunits. To further investigate the dissociation mechanisms, potential energy curves (PECs) and surfaces (PESs) for the O2+(H2O) ion were calculated for the ground and excited states. As a result, the H...Continue Reading

References

Sep 18, 2003·Journal of the American Chemical Society·Mingfei ZhouPaul Van Rague Schleyer
Feb 11, 2015·Chemical Reviews·Nicholas S ShumanAlbert A Viggiano
Oct 30, 2015·The Journal of Physical Chemistry Letters·Jonathon A ManerMichael A Duncan
Jun 3, 2017·The Review of Scientific Instruments·Kenichi OkutsuFuminori Misaizu
Feb 3, 2018·The Review of Scientific Instruments·M David JohnstonRicardo B Metz
Oct 9, 2018·Physical Chemistry Chemical Physics : PCCP·Sainish SharmaNicholas A Besley
Feb 3, 2019·The Review of Scientific Instruments·Zefeng HuaDongfeng Zhao

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Citations

Jul 10, 2021·The Journal of Chemical Physics·Yuji NakashimaFuminori Misaizu

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