Ortho-Para Conversion of Molecularly Chemisorbed H₂ on Pd(210)

• UETA Hirokazu

  Advanced Science Research Center, Japan Atomic Energy Agency (JAEA)

• FUKUTANI Katsuyuki

  Advanced Science Research Center, Japan Atomic Energy Agency (JAEA) Institute of Industrial Science (IIS), The University of Tokyo

Bibliographic Information

Other Title

• Pd(210)表面に化学吸着したH₂オルト–パラ転換
• Pd(210)表面に化学吸着したH₂オルト-パラ転換
• Pd(210)ヒョウメン ニ カガク キュウチャク シタ H ₂ オルト-パラ テンカン

Abstract

A unique molecularly chemisorption of H₂ occurs on some stepped surfaces in addition to the typical adsorption schemes of physisorption and dissociation. In the present study, the rotational state and ortho-to-para (o-p) conversion of the molecularly chemisorbed H₂ on Pd(210) at a surface temperature of 50 K were probed by combining a pulsed molecular beam, photo-stimulated desorption and resonance-enhanced multiphoton ionization techniques. We experimentally demonstrated that the o-p conversion proceeds with a conversion time constant of ～2 s that is 2–3 orders of magnitude smaller than those reported for physisorption systems. The origins of such fast conversion and the rotational state distribution of H₂ in molecular chemisorption state are discussed.

Journal

• Vacuum and Surface Science

  Vacuum and Surface Science 64 (9), 430-434, 2021-09-10

  The Japan Society of Vacuum and Surface Science

Keywords

• hydrogen
• ortho-para conversion
• chemisorption
• Palladium

Details

• CRID: 1390289332389411072
• NII Article ID: 130008087640
• NII Book ID: AA12808657
• DOI: 10.1380/vss.64.430
• ISSN: 24335843
• ISSN: 24335835
• NDL BIB ID: 031720652
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I031720652
• Web Site: https://www.jstage.jst.go.jp/article/vss/64/9/64_20180773/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed