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Mechanism of the ortho-para conversion of hydrogen on Ag surfaces
Abstract
Ortho-para conversion of ${\mathrm{H}}_{2}$ and para-ortho conversion of ${\mathrm{D}}_{2}$ on an Ag surface were investigated by resonance-enhanced multiphoton ionization combined with photostimulated desorption. The conversion processes were found to be accelerated by laser irradiation at $193\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$, while photo-irradiation at $532\phantom{\rule{0.3em}{0ex}}\mathrm{nm}$ had little effect on the conversion time. The natural conversion time of ${\mathrm{H}}_{2}$ and ${\mathrm{D}}_{2}$ was estimated to be 610 and $1030\phantom{\rule{0.3em}{0ex}}\mathrm{s}$, respectively. The roles of electron transfer and rotational-energy dissipation in the conversion are discussed.
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Some materials, such as silver, copper, charcoal, graphite, and supported chromium and ferric oxides, have been found effective for ortho-to para-hydrogen conversion.
“Some materials, such as silver [81][82][83], copper [84,85], charcoal [56], graphite [86], and supported chromium [87,88] and ferric [89,90] oxides, have been found to be effective for this conversion.”
From 5917. https://doi.org/10.3390/en14185917. - (2021) · cites this paper as [82]
Silver, copper, charcoal, graphite, supported chromium oxides, and supported ferric oxides have been found effective for ortho-to-para hydrogen conversion.
“Some materials, such as silver[81][82][83], copper[84,85], charcoal[56], graphite[86], and supported chromium[87,88] and ferric[89,90] oxides, have been found to be effective for this conversion.”
From 5917. https://doi.org/10.3390/en14185917. - (2021) · cites this paper as [82]
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Research works printed but not linked: 20
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(2021) · doi:10.3390/en14185917 · Cited by 708
Metadata
- Authors
- Niki, K., Kawauchi, T., Matsumoto, M., Fukutani, K., & Okano, T.
- Affiliations
- Institute of Industrial Science, The University of Tokyo (JP)
- Japan Science and Technology Agency (JP)
- Venue
- Physical Review B
- Publisher
- American Physical Society (APS)
- Published
- 2008-05-22
- Volume
- 77
- Issue
- 20
- ISSN
- 1098-0121 (ISSN-L)
- 1550-235X
- OpenAlex
- W2017138755
- Cited by
- 32
- References
- 0
- Citations by year
- 2025: 3 · 2023: 4 · 2022: 1 · 2021: 3 · 2020: 1 · 2019: 2 · 2018: 2 · 2017: 2 · 2016: 3 · 2015: 1 · 2014: 2 · 2013: 3
- FWCI
- 1.10
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Physical Review B (publishedVersion)
- Funders
- Japan Society for the Promotion of Science (20246011)
- Topics
- Physical Sciences › Chemistry › Physical and Theoretical Chemistry › Surface Chemistry and Catalysis
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum, superfluid, helium dynamics
- Physical Sciences › Physics and Astronomy › Condensed Matter Physics › Surface and Thin Film Phenomena
- Keywords
- ortho-para conversion, hydrogen adsorption, deuterium, silver surface, rotational isomerization, laser irradiation, 193 nm excitation, conversion time, electron transfer, resonance-enhanced multiphoton ionization
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