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

Abstract

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.

Authors:

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)

Publication Date:: 2018-09-20

Research Org.:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

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

OSTI Identifier:: 1477706

Report Number(s):: LA-UR-18-28856
Journal ID: ISSN 1089-5639

Grant/Contract Number:: AC52-06NA25396

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory

Additional Journal Information:: Journal Volume: 122; Journal Issue: 41; Journal ID: ISSN 1089-5639

Publisher:: American Chemical Society

Country of Publication:: United States

Language:: English

Subject:: 36 MATERIALS SCIENCE; Planetary Sciences

Citation Formats


                    Shi, Xiaoyu, Gao, Hong, Yin, Qing -Zhu, Chang, Yih -Chung, Wiens, Roger Craig, Jackson, William M., and Ng, Cheuk -Yiu. 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.  United States: N. p., 2018. 
Web.  https://doi.org/10.1021/acs.jpca.8b08058.

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                    Shi, Xiaoyu, Gao, Hong, Yin, Qing -Zhu, Chang, Yih -Chung, Wiens, Roger Craig, Jackson, William M., & Ng, Cheuk -Yiu. 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.  United States.  https://doi.org/10.1021/acs.jpca.8b08058

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                    Shi, Xiaoyu, Gao, Hong, Yin, Qing -Zhu, Chang, Yih -Chung, Wiens, Roger Craig, Jackson, William M., and Ng, Cheuk -Yiu. Thu .  
"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".  United States.  https://doi.org/10.1021/acs.jpca.8b08058.  https://www.osti.gov/servlets/purl/1477706.

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@article{osti_1477706,

  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},

  author       = {Shi, Xiaoyu and Gao, Hong and Yin, Qing -Zhu and Chang, Yih -Chung and Wiens, Roger Craig and Jackson, William M. and Ng, Cheuk -Yiu},

  abstractNote = {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.},

  doi          = {10.1021/acs.jpca.8b08058},

  journal      = {Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory},

  number       = 41,

  volume       = 122,

  place        = {United States},

  year         = {2018},

  month        = {9}

}

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https://doi.org/10.1021/acs.jpca.8b08058

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Cited by: 3 works

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Figures / Tables:

Figure 1: Carbon ion PHOFEX spectra for the four ¹$\Pi$ bands of ¹²C¹⁶O: (a) band #13 with upper state ¹$\Pi$ (v′ = 2), (b) band #14 with upper state ¹$\Pi$ (v′ = 2), (c) band #15A with upper state ¹$\Pi$(v′ = 0), and (d) band #15B with upper state (5p$π$)more »

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Works referencing / citing this record:

Rotational dependence of the branching ratios and fragment angular distributions for the photodissociation of ¹² C ¹⁶ O in the Rydberg 4p(2) and 5p(0) complex region (92.84–93.37 nm)
journal, January 2019

Jiang, Pan; Chi, Xiaoping; Qi, Wenke
Physical Chemistry Chemical Physics, Vol. 21, Issue 26
DOI: 10.1039/c8cp07620k

Rotational dependence of the branching ratios and fragment angular distributions for the photodissociation of ¹² C ¹⁶ O in the Rydberg 4p(2) and 5p(0) complex region (92.84–93.37 nm)
journal, January 2019

Jiang, Pan; Chi, Xiaoping; Qi, Wenke
Physical Chemistry Chemical Physics, Vol. 21, Issue 26
DOI: 10.1039/c8cp07620k

Strong and selective isotope effect in the vacuum ultraviolet photodissociation branching ratios of carbon monoxide
journal, July 2019

Jiang, Pan; Chi, Xiaoping; Zhu, Qihe
Nature Communications, Vol. 10, Issue 1
DOI: 10.1038/s41467-019-11086-z

Channel-resolved rotationally dependent predissociation rate constants reveal the state-to-state dissociation dynamics of carbon monoxide in electronically excited states
journal, January 2020

Jiang, Pan; Chi, Xiaoping; Zhu, Qihe
Physical Chemistry Chemical Physics, Vol. 22, Issue 4
DOI: 10.1039/c9cp06351j

Photodissociation branching ratios for several absorption bands of ¹² C ¹⁶ O from 108,500 to 109,220 cm ⁻¹
journal, January 2020

Chi, Xiaoping; Jiang, Pan; Zhu, Qihe
Molecular Physics
DOI: 10.1080/00268976.2020.1718228

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Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.

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Similar Records

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

Abstract

Citation Formats

Figures / Tables:

Rotational dependence of the branching ratios and fragment angular distributions for the photodissociation of 12 C 16 O in the Rydberg 4p(2) and 5p(0) complex region (92.84–93.37 nm) journal, January 2019

Rotational dependence of the branching ratios and fragment angular distributions for the photodissociation of 12 C 16 O in the Rydberg 4p(2) and 5p(0) complex region (92.84–93.37 nm) journal, January 2019

Strong and selective isotope effect in the vacuum ultraviolet photodissociation branching ratios of carbon monoxide journal, July 2019

Channel-resolved rotationally dependent predissociation rate constants reveal the state-to-state dissociation dynamics of carbon monoxide in electronically excited states journal, January 2020

Photodissociation branching ratios for several absorption bands of 12 C 16 O from 108,500 to 109,220 cm −1 journal, January 2020

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

Rotational dependence of the branching ratios and fragment angular distributions for the photodissociation of ¹² C ¹⁶ O in the Rydberg 4p(2) and 5p(0) complex region (92.84–93.37 nm)
journal, January 2019

Rotational dependence of the branching ratios and fragment angular distributions for the photodissociation of ¹² C ¹⁶ O in the Rydberg 4p(2) and 5p(0) complex region (92.84–93.37 nm)
journal, January 2019

Strong and selective isotope effect in the vacuum ultraviolet photodissociation branching ratios of carbon monoxide
journal, July 2019

Channel-resolved rotationally dependent predissociation rate constants reveal the state-to-state dissociation dynamics of carbon monoxide in electronically excited states
journal, January 2020

Photodissociation branching ratios for several absorption bands of ¹² C ¹⁶ O from 108,500 to 109,220 cm ⁻¹
journal, January 2020