FTIR study of nuclear spin conversion of solid normal hydrogen at 4.2K, doped with H2O, CH3F, CH4 and double doped with O2. Evidence of ortho-H2 catalyzed conversion by CH3F
| Autor: | L. Abouaf-Marguin, A.-M. Vasserot, A. Lekic |
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| Přispěvatelé: | Laboratoire de Physique Moleculaire pour l'Atmosphere et l'Astrophysique (LPMAA), Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2009 |
| Předmět: |
Hydrogen
[PHYS.ASTR.EP]Physics [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] Chemistry Diffusion Doping [SDU.ASTR.EP]Sciences of the Universe [physics]/Astrophysics [astro-ph]/Earth and Planetary Astrophysics [astro-ph.EP] Analytical chemistry General Physics and Astronomy chemistry.chemical_element Catalysis Impurity Molecule Physical and Theoretical Chemistry Fourier transform infrared spectroscopy ComputingMilieux_MISCELLANEOUS |
| Zdroj: | Chemical Physics Letters Chemical Physics Letters, 2009, 470, pp.228-232. ⟨10.1016/j.cplett.2009.01.047⟩ |
| ISSN: | 0009-2614 |
| DOI: | 10.1016/j.cplett.2009.01.047 |
| Popis: | From the IR induced spectrum between 4000 and 5000 cm −1 of solid normal hydrogen doped with H 2 O, CH 3 F, CH 4 , and double doped with O 2 , the nuclear spin conversion of ortho -H 2 molecules has been analyzed at 4.2 K. The self-conversion rate is determined to be K sc = 2.8(3) × 10 −4 min −1 , with no implication of O 2 atmospheric impurity. Within the framework of an ortho -H 2 diffusion dominated process, the O 2 catalyzed conversion rate is deduced to be K cc = 0.17(3) min −1 . We have shown that CH 3 F induces ortho -H 2 conversion at the same rate as O 2 , according to a diffusion controlled process, via intra-cluster conversion. |
| Databáze: | OpenAIRE |
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