Formation mechanisms of oxygen atoms in the O(3PJ) state from the 157 nm photoirradiation of amorphous water ice at 90 K

• Hama, Tetsuya

• Yabushita, Akihiro

• Yokoyama, Masaaki

• Kawasaki, Masahiro

• Watanabe, Naoki

Abstract

Desorption of ground state O(3P_[J= 2,1,0]) atoms following the vacuum ultraviolet photolysis of water ice in the first absorption band was directly measured with resonance-enhanced multiphoton ionization (REMPI) method. Based on their translational energy distributions and evolution behavior, two different formation mechanisms are proposed: One is exothermic recombination reaction of OH radicals, OH+OH → H2O+O(3PJ) and the other is the photodissociation of OH radicals on the surface of amorphous solid water. The translational and internal energy distributions of OH radicals as well as the evolution behavior were also measured by REMPI to elucidate the roles of H2O2 and OH in the O(3PJ) formation mechanisms. © 2009 American Institute of Physics.

Journal

• Journal of Chemical Physics

  Journal of Chemical Physics 131 (11), 114511-, 2009-09-21

  American Institute of Physics

Keywords

• amorphous state
• desorption
• ground states
• ice
• oxygen
• photoionisation
• photolysis
• reaction kinetics
• translational states
• ultraviolet radiation effects

Details

• CRID: 1050282813978809856
• NII Article ID: 120001629761
• HANDLE: 2115/39511
• ISSN: 00219606
• Text Lang: en
• Article Type: journal article
• Data Source:
  • IRDB
  • CiNii Articles