Formation mechanisms of oxygen atoms in the O(1D2) state from the 157 nm photoirradiation of amorphous water ice at 90 K

Tetsuya Hama; Akihiro Yabushita; Masaaki Yokoyama; Masahiro Kawasaki; Naoki Watanabe

doi:10.1063/1.3194798

Formation mechanisms of oxygen atoms in the O(¹D₂) state from the 157 nm photoirradiation of amorphous water ice at 90 K

Tetsuya Hama, Akihiro Yabushita, Masaaki Yokoyama, Masahiro Kawasaki, Naoki Watanabe

Research output: Contribution to journal › Article › peer-review

22 Citations (Scopus)

Abstract

Vacuum ultraviolet photolysis of water ice in the first absorption band was studied at 157 nm. Translational and internal energy distributions of the desorbed species, O(¹D) and OH(v=0,1), were directly measured with resonance-enhanced multiphoton ionization method. Two different mechanisms are discussed for desorption of electronically excited O(¹D) atoms from the ice surface. One is unimolecular dissociation of H₂O to H ₂+O(¹D) as a primary photoprocess. The other is the surface recombination reaction of hot OH radicals that are produced from photodissociation of hydrogen peroxide as a secondary photoprocess. H ₂O₂ is one of the major photoproducts in the vacuum ultraviolet photolysis of water ice.

Original language	English
Article number	114510
Journal	Journal of Chemical Physics
Volume	131
Issue number	11
DOIs	https://doi.org/10.1063/1.3194798
Publication status	Published - 2009
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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10.1063/1.3194798

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@article{1f96cceae99a42cc9897a89dc38b70b5,

title = "Formation mechanisms of oxygen atoms in the O(1D2) state from the 157 nm photoirradiation of amorphous water ice at 90 K",

abstract = "Vacuum ultraviolet photolysis of water ice in the first absorption band was studied at 157 nm. Translational and internal energy distributions of the desorbed species, O(1D) and OH(v=0,1), were directly measured with resonance-enhanced multiphoton ionization method. Two different mechanisms are discussed for desorption of electronically excited O(1D) atoms from the ice surface. One is unimolecular dissociation of H2O to H 2+O(1D) as a primary photoprocess. The other is the surface recombination reaction of hot OH radicals that are produced from photodissociation of hydrogen peroxide as a secondary photoprocess. H 2O2 is one of the major photoproducts in the vacuum ultraviolet photolysis of water ice.",

author = "Tetsuya Hama and Akihiro Yabushita and Masaaki Yokoyama and Masahiro Kawasaki and Naoki Watanabe",

note = "Funding Information: The authors thank Professor H.-P. Loock of Queen{\textquoteright}s University for the simulation of the rotational spectra of OH radicals and Dr. S. Andersson of SINTEF Materials and Chemistry for fruitful discussions and comments. This work is supported by a grant-in-aid from JSPS (20245005).",

year = "2009",

doi = "10.1063/1.3194798",

language = "English",

volume = "131",

journal = "Journal of Chemical Physics",

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T1 - Formation mechanisms of oxygen atoms in the O(1D2) state from the 157 nm photoirradiation of amorphous water ice at 90 K

AU - Hama, Tetsuya

AU - Yabushita, Akihiro

AU - Yokoyama, Masaaki

AU - Kawasaki, Masahiro

AU - Watanabe, Naoki

N1 - Funding Information: The authors thank Professor H.-P. Loock of Queen’s University for the simulation of the rotational spectra of OH radicals and Dr. S. Andersson of SINTEF Materials and Chemistry for fruitful discussions and comments. This work is supported by a grant-in-aid from JSPS (20245005).

PY - 2009

Y1 - 2009

N2 - Vacuum ultraviolet photolysis of water ice in the first absorption band was studied at 157 nm. Translational and internal energy distributions of the desorbed species, O(1D) and OH(v=0,1), were directly measured with resonance-enhanced multiphoton ionization method. Two different mechanisms are discussed for desorption of electronically excited O(1D) atoms from the ice surface. One is unimolecular dissociation of H2O to H 2+O(1D) as a primary photoprocess. The other is the surface recombination reaction of hot OH radicals that are produced from photodissociation of hydrogen peroxide as a secondary photoprocess. H 2O2 is one of the major photoproducts in the vacuum ultraviolet photolysis of water ice.

AB - Vacuum ultraviolet photolysis of water ice in the first absorption band was studied at 157 nm. Translational and internal energy distributions of the desorbed species, O(1D) and OH(v=0,1), were directly measured with resonance-enhanced multiphoton ionization method. Two different mechanisms are discussed for desorption of electronically excited O(1D) atoms from the ice surface. One is unimolecular dissociation of H2O to H 2+O(1D) as a primary photoprocess. The other is the surface recombination reaction of hot OH radicals that are produced from photodissociation of hydrogen peroxide as a secondary photoprocess. H 2O2 is one of the major photoproducts in the vacuum ultraviolet photolysis of water ice.

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Formation mechanisms of oxygen atoms in the O(¹D₂) state from the 157 nm photoirradiation of amorphous water ice at 90 K

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