Branching Ratio Measurements of the Predissociation of 12C16O by Time-Slice Velocity-Map Ion Imaging in the Energy Region from 106 250 to 107 800 cm –1

Shi, Xiaoyu; Gao, Hong; Yin, Qing -Zhu; Chang, Yih -Chung; Wiens, Roger Craig; Jackson, William M.; Ng, Cheuk -Yiu

doi:10.1021/acs.jpca.8b08058

Title: Branching Ratio Measurements of the Predissociation of ¹²C¹⁶O by Time-Slice Velocity-Map Ion Imaging in the Energy Region from 106 250 to 107 800 cm ^–1

Journal Article · 20 September 2018 · Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory

DOI: https://doi.org/10.1021/acs.jpca.8b08058 · OSTI ID:1477706

Shi, Xiaoyu ^[1]; Gao, Hong ^[2]; Yin, Qing -Zhu ^[3]; Chang, Yih -Chung ^[3];

^[4];

^[3];

^[3]

Univ. of California, Davis, CA (United States); Univ. of California, San Francisco, CA (United States)
Univ. of California, Davis, CA (United States); Chinese Academy of Sciences (CAS), Beijing (China)
Univ. of California, Davis, CA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Photodissociation of CO is a fundamental chemical mechanism for mass-independent oxygen isotope fractionation in the early Solar System. Branching ratios of photodissociation channels for individual bands quantitatively yield the trapping efficiencies of atomic oxygen resulting into oxides. We measured the branching ratios for the spin-forbidden and spin-allowed photodissociation channels of ¹²C¹⁶O in the vacuum ultraviolet (VUV) photon energy region from 106 250 to 107 800 cm^–1 using the VUV laser time-slice velocity-map imaging photoion technique. The excitations to four 1Π bands and three ¹Σ⁺ bands of ¹²C¹⁶O were identified and investigated. The branching ratios for the product channels C(³P) + O(³P), C(¹D) + O(³P), and C(³P) + O(¹D) of these predissociative states strongly depend on the electronic and vibrational states of CO being excited. Furthermore, by plotting the branching ratio of the spin-forbidden dissociation channels versus the excitation energy from 102 500 to 110 500 cm^–1 that has been measured so far, the global pattern of the ¹Π–³Π interaction that plays a key role in the predissociation of CO is revealed and discussed.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE Laboratory Directed Research and Development (LDRD) Program

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1477706

Report Number(s):: LA-UR-18-28856

Journal Information:: Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory, Vol. 122, Issue 41; ISSN 1089-5639

Publisher:: American Chemical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 16 works

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