Methane clathrate: CH4 quantum rotor state dependent rattling potential
In methane hydrate the dominant peak in the density of states above 3 meV represents a rattling mode of the guest molecule CH(4) in the large ice cages. This mode shifts from 6.7 meV at T=4.5 K to T=30 K to 7.14 meV with conversion of CH(4) guest molecules into the tunneling ground state. The less s...
Published in: | The Journal of Chemical Physics |
---|---|
Main Authors: | , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
American Institute of Physics
2006
|
Subjects: | |
Online Access: | https://juser.fz-juelich.de/record/57070 https://juser.fz-juelich.de/search?p=id:%22PreJuSER-57070%22 |
id |
ftfzjuelichnvdb:oai:juser.fz-juelich.de:57070 |
---|---|
record_format |
openpolar |
spelling |
ftfzjuelichnvdb:oai:juser.fz-juelich.de:57070 2024-09-15T18:18:40+00:00 Methane clathrate: CH4 quantum rotor state dependent rattling potential Prager, M. Press, W. DE 2006 https://juser.fz-juelich.de/record/57070 https://juser.fz-juelich.de/search?p=id:%22PreJuSER-57070%22 eng eng American Institute of Physics info:eu-repo/semantics/altIdentifier/wos/WOS:000242646200029 info:eu-repo/semantics/altIdentifier/pmid/pmid:17166036 info:eu-repo/semantics/altIdentifier/hdl/2128/19089 info:eu-repo/semantics/altIdentifier/issn/0021-9606 info:eu-repo/semantics/altIdentifier/doi/10.1063/1.2400031 https://juser.fz-juelich.de/record/57070 https://juser.fz-juelich.de/search?p=id:%22PreJuSER-57070%22 info:eu-repo/semantics/openAccess The journal of chemical physics 125, 214703 (2006). doi:10.1063/1.2400031 info:eu-repo/classification/ddc/540 J info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion 2006 ftfzjuelichnvdb https://doi.org/10.1063/1.2400031 2024-08-05T23:55:45Z In methane hydrate the dominant peak in the density of states above 3 meV represents a rattling mode of the guest molecule CH(4) in the large ice cages. This mode shifts from 6.7 meV at T=4.5 K to T=30 K to 7.14 meV with conversion of CH(4) guest molecules into the tunneling ground state. The less symmetric angular density distribution PsiPsi(*) in the excited rotational state compared to the ground state allows the methane to fit better in the orientation dependent cage potential surface. This leads to a larger average distance to the cage-forming molecules with a weaker potential and a reduced rattling energy. A two state single particle model with characteristic rattling energies of 5.20 meV for pure T-methane and 7.3 meV for pure A-methane weighted by the population factors can fit the data. Article in Journal/Newspaper Methane hydrate Forschungszentrum Jülich: JuSER (Juelich Shared Electronic Resources) The Journal of Chemical Physics 125 21 214703 |
institution |
Open Polar |
collection |
Forschungszentrum Jülich: JuSER (Juelich Shared Electronic Resources) |
op_collection_id |
ftfzjuelichnvdb |
language |
English |
topic |
info:eu-repo/classification/ddc/540 J |
spellingShingle |
info:eu-repo/classification/ddc/540 J Prager, M. Press, W. Methane clathrate: CH4 quantum rotor state dependent rattling potential |
topic_facet |
info:eu-repo/classification/ddc/540 J |
description |
In methane hydrate the dominant peak in the density of states above 3 meV represents a rattling mode of the guest molecule CH(4) in the large ice cages. This mode shifts from 6.7 meV at T=4.5 K to T=30 K to 7.14 meV with conversion of CH(4) guest molecules into the tunneling ground state. The less symmetric angular density distribution PsiPsi(*) in the excited rotational state compared to the ground state allows the methane to fit better in the orientation dependent cage potential surface. This leads to a larger average distance to the cage-forming molecules with a weaker potential and a reduced rattling energy. A two state single particle model with characteristic rattling energies of 5.20 meV for pure T-methane and 7.3 meV for pure A-methane weighted by the population factors can fit the data. |
format |
Article in Journal/Newspaper |
author |
Prager, M. Press, W. |
author_facet |
Prager, M. Press, W. |
author_sort |
Prager, M. |
title |
Methane clathrate: CH4 quantum rotor state dependent rattling potential |
title_short |
Methane clathrate: CH4 quantum rotor state dependent rattling potential |
title_full |
Methane clathrate: CH4 quantum rotor state dependent rattling potential |
title_fullStr |
Methane clathrate: CH4 quantum rotor state dependent rattling potential |
title_full_unstemmed |
Methane clathrate: CH4 quantum rotor state dependent rattling potential |
title_sort |
methane clathrate: ch4 quantum rotor state dependent rattling potential |
publisher |
American Institute of Physics |
publishDate |
2006 |
url |
https://juser.fz-juelich.de/record/57070 https://juser.fz-juelich.de/search?p=id:%22PreJuSER-57070%22 |
op_coverage |
DE |
genre |
Methane hydrate |
genre_facet |
Methane hydrate |
op_source |
The journal of chemical physics 125, 214703 (2006). doi:10.1063/1.2400031 |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000242646200029 info:eu-repo/semantics/altIdentifier/pmid/pmid:17166036 info:eu-repo/semantics/altIdentifier/hdl/2128/19089 info:eu-repo/semantics/altIdentifier/issn/0021-9606 info:eu-repo/semantics/altIdentifier/doi/10.1063/1.2400031 https://juser.fz-juelich.de/record/57070 https://juser.fz-juelich.de/search?p=id:%22PreJuSER-57070%22 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1063/1.2400031 |
container_title |
The Journal of Chemical Physics |
container_volume |
125 |
container_issue |
21 |
container_start_page |
214703 |
_version_ |
1810456753808080896 |