Translational and rotational energy measurements of photodesorbed water molecules in their vibrational ground state from amorphous solid water

Akihiro Yabushita, Tetsuya Hama, Masaaki Yokoyama, Masahiro Kawasaki, Stefan Andersson, Richard N. Dixon, Michael N.R. Ashfold, Naoki Watanabe

研究成果: Contribution to journalArticle査読

24 被引用数 (Scopus)

抄録

For interstellar grains coated with water ice, the most important desorption mechanism at the edge of molecular clouds is photodesorption of water. To reveal details of the photodesorption mechanism, we have measured the translational and rotational energies of H2O (v = 0) molecules photodesorbed from amorphous solid water and polycrystalline ice following excitation within the first absorption band using a 157nm laser. The measured translational and rotational temperatures are 1800K and 300K, respectively. These energies are in good accord with those predicted by classical molecular dynamics calculations for the "kick-out" of an H2O molecule in the ice by an energetic H atom. The statistical ortho:para ratio of g OPR = 3 is appropriate for the Boltzmann rotational distribution of the H2O molecules.

本文言語英語
ページ(範囲)L80-L83
ジャーナルAstrophysical Journal
699
2 PART 2
DOI
出版ステータス出版済み - 2009
外部発表はい

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

フィンガープリント 「Translational and rotational energy measurements of photodesorbed water molecules in their vibrational ground state from amorphous solid water」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

引用スタイル