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Title: Internal energy dependence of the photodissociation dynamics of O3- using cryogenic photoelectron-photofragment coincidence spectroscopy

Journal Article · · Journal of Chemical Physics
DOI: https://doi.org/10.1063/1.4986500 · OSTI ID:1535315

Photoelectron-photofragment coincidence (PPC) spectra of ozonide, O3-, were measured at 388 nm (E = 3.20 eV) using a newly constructed cryogenic octopole accumulation trap coupled to a PPC spectrometer. The photoelectron spectra reveal three processes consisting of a stable photodetachment channel, and two distinct photodissociation pathways yielding (1) O2 + O- or (2) O + O2-. The first photodissociation pathway is observed in the PPC spectra by photodetachment of the O- product by a second photon, and produces electronically excited O2(1Δg). The O2- product of the second photodissociation pathway undergoes autodetachment for O2-(2Πg, v" > 4), a process greatly enhanced by vibrational excitation of the precursor O3-. Cooling anions thermalized at 300 K to <17 K in a cryogenic octopole accumulation trap essentially turns off this autodetachment pathway. The product kinetic energy distribution in coincidence with the autodetached electrons from O2-(v′′ = 4) exhibits resolved features consistent with bend (ν2), asymmetric stretch (ν3) and a stretching combination band (ν1 + ν3) in the intermediate electronic state, illustrating the insights that can be gained from kinematically complete measurements. Finally, these results are discussed in the context of the low-lying excited states of O3-.

Research Organization:
Univ. of California, San Diego, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
FG03-98ER14879
OSTI ID:
1535315
Alternate ID(s):
OSTI ID: 1378813
Journal Information:
Journal of Chemical Physics, Vol. 147, Issue 9; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

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Resonance‐Mediated Below‐Threshold Delayed Photoemission and Non‐Franck–Condon Photodissociation of Cold Oxyallyl Anions journal April 2019
A high beam energy photoelectron-photofragment coincidence spectrometer for complex anions journal December 2018
Photoelectron-Photofragment Coincidence Spectroscopy With Ions Prepared in a Cryogenic Octopole Accumulation Trap: Collisional Excitation and Buffer Gas Cooling journal April 2019
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