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- W4200283912 abstract "Hydrogen molecules have two nuclear spin isomers: ortho-H2 and para-H2. The ortho-to-para ratio (OPR) is known to affect chemical evolution as well as gas dynamics in space. Therefore, understanding the mechanism of OPR variation in astrophysical environments is important. In this work, the nuclear spin conversion (NSC) processes of H2 molecules on diamond-like carbon and graphite surfaces are investigated experimentally by employing temperature-programmed desorption and resonance-enhanced multiphoton ionization methods. For the diamond-like carbon surface, the NSC time constants were determined at temperatures of 10-18 K and from 3900 plusminus 800 s at 10 K to 750 plusminus 40 s at 18 K. Similar NSC time constants and temperature dependence were observed for a graphite surface, indicating that bonding motifs (sp3 or sp2 hybridization) have little effect on the NSC rates." @default.
- W4200283912 created "2021-12-31" @default.
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- W4200283912 date "2021-12-01" @default.
- W4200283912 modified "2023-10-01" @default.
- W4200283912 title "Measurements of Ortho-to-para Nuclear Spin Conversion of H<sub>2</sub> on Low-temperature Carbonaceous Grain Analogs: Diamond-like Carbon and Graphite" @default.
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- W4200283912 doi "https://doi.org/10.3847/1538-4357/ac2a33" @default.
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