Zero-phonon emission bands of solid hydrogen at 6-12 μm wavelength. An astrophysical phenomenon
Infrared emission bands in the wavelength range of 6–12 μm observed in the ISO-SWS mission are assigned to rotational zero-phonon bands of solid parahydrogen by using Van Kranendonk’s approximate rigid-lattice method. This method is based on superposed electric quadrupole pair interactions and super...
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| Veröffentlicht in: | Физика низких температур |
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| Datum: | 2009 |
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| Sprache: | Englisch |
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Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України
2009
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| Назва журналу: | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| Zitieren: | Zero-phonon emission bands of solid hydrogen at 6-12 μm wavelength. An astrophysical phenomenon / J. Schaefer // Физика низких температур. — 2009. — Т. 35, № 4. — С. 405-412. — Бібліогр.: 10 назв. — англ. |
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Digital Library of Periodicals of National Academy of Sciences of Ukraine| _version_ | 1862618514980864000 |
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| author | Schaefer, J. |
| author_facet | Schaefer, J. |
| citation_txt | Zero-phonon emission bands of solid hydrogen at 6-12 μm wavelength. An astrophysical phenomenon / J. Schaefer // Физика низких температур. — 2009. — Т. 35, № 4. — С. 405-412. — Бібліогр.: 10 назв. — англ. |
| collection | DSpace DC |
| container_title | Физика низких температур |
| description | Infrared emission bands in the wavelength range of 6–12 μm observed in the ISO-SWS mission are assigned to rotational zero-phonon bands of solid parahydrogen by using Van Kranendonk’s approximate rigid-lattice method. This method is based on superposed electric quadrupole pair interactions and superposed quadrupole induced dipole moments of pairs in the hcp crystal. Accordingly, the approximate formalism uses zero-order H₂ pair wave functions. Symmetry effects of the hcp crystal require preference of rotational pair transitions. The interaction potential of the pairs is confined to the electric quadrupole–quadrupole interaction. Zero-phonon emission bands of H₂ pair transitions fitted to the spectrum contain at least one delocalized j = 2 state initially and/or finally because of their significantly enhanced emission rates. They also yield the characteristic band widths which fit nicely to the widths of the observed features. The frequency positions of the seven pure parahydrogen pair transitions used, obtained from experimentally determined rotational solid hydrogen energy levels, are in perfect agreement with the observed features, whereas the three mixed ortho–para pair transitions need a presently unknown frequency correction, caused by the migration of the ortho-H₂ molecules into the parahydrogen crystal prior to emission, the so-called initial excess binding energies. The astrophysical setup of the observed source is discussed in the end of the paper. 
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| first_indexed | 2025-12-07T13:14:00Z |
| format | Article |
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| id | nasplib_isofts_kiev_ua-123456789-117127 |
| institution | Digital Library of Periodicals of National Academy of Sciences of Ukraine |
| issn | 0132-6414 |
| language | English |
| last_indexed | 2025-12-07T13:14:00Z |
| publishDate | 2009 |
| publisher | Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України |
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| spelling | Schaefer, J. 2017-05-20T07:04:42Z 2017-05-20T07:04:42Z 2009 Zero-phonon emission bands of solid hydrogen at 6-12 μm wavelength. An astrophysical phenomenon / J. Schaefer // Физика низких температур. — 2009. — Т. 35, № 4. — С. 405-412. — Бібліогр.: 10 назв. — англ. 0132-6414 PACS: 95.30.Gv, 63.20.D– https://nasplib.isofts.kiev.ua/handle/123456789/117127 Infrared emission bands in the wavelength range of 6–12 μm observed in the ISO-SWS mission are assigned to rotational zero-phonon bands of solid parahydrogen by using Van Kranendonk’s approximate rigid-lattice method. This method is based on superposed electric quadrupole pair interactions and superposed quadrupole induced dipole moments of pairs in the hcp crystal. Accordingly, the approximate formalism uses zero-order H₂ pair wave functions. Symmetry effects of the hcp crystal require preference of rotational pair transitions. The interaction potential of the pairs is confined to the electric quadrupole–quadrupole interaction. Zero-phonon emission bands of H₂ pair transitions fitted to the spectrum contain at least one delocalized j = 2 state initially and/or finally because of their significantly enhanced emission rates. They also yield the characteristic band widths which fit nicely to the widths of the observed features. The frequency positions of the seven pure parahydrogen pair transitions used, obtained from experimentally determined rotational solid hydrogen energy levels, are in perfect agreement with the observed features, whereas the three mixed ortho–para pair transitions need a presently unknown frequency correction, caused by the migration of the ortho-H₂ molecules into the parahydrogen crystal prior to emission, the so-called initial excess binding energies. The astrophysical setup of the observed source is discussed in the end of the paper. 
 Remove selected en Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України Физика низких температур 7th International Conference on Cryocrystals and Quantum Crystals Zero-phonon emission bands of solid hydrogen at 6-12 μm wavelength. An astrophysical phenomenon Article published earlier |
| spellingShingle | Zero-phonon emission bands of solid hydrogen at 6-12 μm wavelength. An astrophysical phenomenon Schaefer, J. 7th International Conference on Cryocrystals and Quantum Crystals |
| title | Zero-phonon emission bands of solid hydrogen at 6-12 μm wavelength. An astrophysical phenomenon |
| title_full | Zero-phonon emission bands of solid hydrogen at 6-12 μm wavelength. An astrophysical phenomenon |
| title_fullStr | Zero-phonon emission bands of solid hydrogen at 6-12 μm wavelength. An astrophysical phenomenon |
| title_full_unstemmed | Zero-phonon emission bands of solid hydrogen at 6-12 μm wavelength. An astrophysical phenomenon |
| title_short | Zero-phonon emission bands of solid hydrogen at 6-12 μm wavelength. An astrophysical phenomenon |
| title_sort | zero-phonon emission bands of solid hydrogen at 6-12 μm wavelength. an astrophysical phenomenon |
| topic | 7th International Conference on Cryocrystals and Quantum Crystals |
| topic_facet | 7th International Conference on Cryocrystals and Quantum Crystals |
| url | https://nasplib.isofts.kiev.ua/handle/123456789/117127 |
| work_keys_str_mv | AT schaeferj zerophononemissionbandsofsolidhydrogenat612μmwavelengthanastrophysicalphenomenon |