DOI: 10.1139/p02-140. Inelastic neutron scattering and low-energy excitation of amorphous SF<sub>6</sub> hydrate prepared by vapor-deposition technique

Inelastic neutron scattering and low-energy excitation of amorphous SF6 hydrate prepared by vapor-deposition technique

10.1139/p02-140

Crossref journal-article

Canadian Science Publishing

Canadian Journal of Physics (155)

Abstract

Amorphous SF6 hydrate (SF6·17H2O) was prepared by depositing the mixed vapor onto a substrate kept at about 8 K. The inelastic neutron-scattering spectra of the as-deposited sample and those annealed at about 120 and 150 K were measured at 50 K in the energy range below 100 meV. The first two samples were considered to be in amorphous states while the third one was in a crystalline state. The librational frequency of the water molecule (at around 60 meV) is smaller in the order of (as-deposited sample) < (annealed sample) < (crystalline sample). This indicates that the strength of the intermolecular hydrogen bonds is (crystalline sample) > (annealed sample) > (as-deposited sample). The spectra below 10 meV were compared with our previous data of pure vapor-deposited amorphous ices and those doped with methanol (CD3OH). The low-energy excitation (E < 6 meV) differed drastically depending on the dopants, i.e., the scattering intensity was enhanced by methanol doping but reduced by SF6 doping. This may be because the hydrogen-bond formation was hindered by methanol doping but promoted rather more by SF6 doping because of the hydrophobic interaction as in clathrate hydrates. PACS Nos.: 61.12Ex, 63.50tx

Bibliography

Yamamuro, O., Matsuo, T., Tsukushi, I., & Onoda-Yamamuro, N. (2003). Inelastic neutron scattering and low-energy excitation of amorphous SF6 hydrate prepared by vapor-deposition technique. Canadian Journal of Physics, 81(1â2), 107â114.

Authors 4

O Yamamuro (first)
T Matsuo (additional)
I Tsukushi (additional)
N Onoda-Yamamuro (additional)

References 26 Referenced 4

M.G. Sceats and S.A. Rice. Water: a comprehensive treatise. Edited by F. Franks. Plenum, New York, 1982. Vol. 7, Chap. 2
V.F. Petrenko and R.W. Whitworth. Physics of ice. Oxford University Press, Oxford, 1999. Chap. 11.
10.1038/310393a0 / Whalley. Nature (London) by Mishima L.D. (1984)
10.1063/1.432298 / Rice. J. Chem. Phys. by Narten C.G. (1976)
10.1063/1.447044 / Pletzer. J. Chem. Phys. by Mayer (1984)
10.1063/1.336179 / Mayer. J. Appl. Phys. (1985)
10.1038/330552a0 / Mayer. Nature (London) by Johari A. (1987)
10.1246/bcsj.41.2591 / Seki. Bull. Chem. Soc. Jpn. by Sugisaki H. (1968)
10.1021/j100360a003 / Johari. J. Phys. Chem. by Hallbrucker E. (1989)
10.1063/1.450622 / Whalley. J. Chem. Phys. by Handa D.D. (1986)
10.1016/0022-3697(87)90130-2 / Suga. J. Phys. Chem. Solids by Yamamuro M. (1987)
10.1063/1.1413963 / Takeda. J. Chem. Phys. by Yamamuro Y. (2001)
D.W. Davidson. Water: a comprehensive treatise. Edited by F. Franks. Plenum, New York, 1982. Vol. 2, Chap. 3
O. Yamamuro and H. Suga. J. Therm. Anal. 35, 2025 (1989). (10.1007/BF01911684)
E. Mayer and A. Hallbrucker. J. Chem. Soc. Chem. Commun. (1989). p. 749. (10.1039/c39890000749)
10.1039/ft9908603785 / Mayer. J. Chem. Soc. Faraday Trans. by Hallbrucker E. (1990)
{'key': 'p_15/p_15_1', 'first-page': '293', 'volume': '1', 'year': '1990', 'journal-title': 'Hallbrucker. J. Chem. Soc. Faraday Trans.'} / Hallbrucker. J. Chem. Soc. Faraday Trans. (1990)
H. Nakayama, H. Omi, T. Eguchi, D.D. Klug, J.S. Tse, C.I. Ratcliffe, and J.A. Ripmeester. High Pressure Sci. Technol. 12, 10 (2002). (10.4131/jshpreview.12.10)
{'key': 'p_17/p_17_1', 'first-page': '433', 'volume': '327', 'author': 'Inoue T.', 'year': '1993', 'journal-title': 'Phys. Res. Sect. A'} / Phys. Res. Sect. A by Inoue T. (1993)
{'key': 'p_18/p_18_1', 'first-page': '841', 'volume': '44', 'author': 'Klug E.', 'year': '1991', 'journal-title': 'Condens. Matter'} / Condens. Matter by Klug E. (1991)
{'key': 'p_19/p_19_1', 'first-page': '3569', 'volume': '59', 'author': 'Kolesnikov J.-C.', 'year': '1999', 'journal-title': 'Condens. Matter'} / Condens. Matter by Kolesnikov J.-C. (1999)
G.E. Walrafen. Water: a comprehensive treatise. Edited by F. Franks. Plenum, New York, 1982. Vol. 1., Chap. 5
D. Eisenberg and W. Kauzmann. The structure and properties of water. Oxford University Press, Oxford. 1969. Chap. 3.
U. Buchenau. In Dynamics of disordered materials. Edited by D. Richter, A.J. Dianoux, W. Petry, and J. Teixeira. Springer, Berlin, 1989. p. 172; U. Buchenau. In Phase transitions and relaxation in systems with competing energy scales. Edited by T. Riste and D. Sherrington. Kluwer, Dordrecht, 1993; B. Frick and D. Richter. Science (Washington, D.C.), 267, 1939 (1995).
10.1088/0953-8984/12/24/306 / Kanaya. J. Phys. Condens. Matter by Yamamuro K. (2000)
10.1063/1.1454992 / Ikeda. J. Chem. Phys. by Madokoro O. (2002)

Dates

Type	When
Created	22 years, 3 months ago (May 30, 2003, 2:24 p.m.)
Deposited	2 months ago (July 2, 2025, 3:06 p.m.)
Indexed	2 months ago (July 3, 2025, 12:18 a.m.)
Issued	22 years, 8 months ago (Jan. 1, 2003)
Published	22 years, 8 months ago (Jan. 1, 2003)
Published Print	22 years, 8 months ago (Jan. 1, 2003)

Funders 0

None

BibTeX

@article{Yamamuro_2003, title={Inelastic neutron scattering and low-energy excitation of amorphous SF6 hydrate prepared by vapor-deposition technique}, volume={81}, ISSN={1208-6045}, url={http://dx.doi.org/10.1139/p02-140}, DOI={10.1139/p02-140}, number={1–2}, journal={Canadian Journal of Physics}, publisher={Canadian Science Publishing}, author={Yamamuro, O and Matsuo, T and Tsukushi, I and Onoda-Yamamuro, N}, year={2003}, month=jan, pages={107–114} }

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  "abstract": "<jats:p> Amorphous SF<jats:sub>6</jats:sub> hydrate (SF<jats:sub>6</jats:sub>\u00b717H<jats:sub>2</jats:sub>O) was prepared by depositing the mixed vapor onto a substrate kept at about 8 K. The inelastic neutron-scattering spectra of the as-deposited sample and those annealed at about 120 and 150 K were measured at 50 K in the energy range below 100 meV. The first two samples were considered to be in amorphous states while the third one was in a crystalline state. The librational frequency of the water molecule (at around 60 meV) is smaller in the order of (as-deposited sample) &lt; (annealed sample) &lt; (crystalline sample). This indicates that the strength of the intermolecular hydrogen bonds is (crystalline sample) &gt; (annealed sample) &gt; (as-deposited sample). The spectra below 10 meV were compared with our previous data of pure vapor-deposited amorphous ices and those doped with methanol (CD<jats:sub>3</jats:sub>OH). The low-energy excitation (E &lt; 6 meV) differed drastically depending on the dopants, i.e., the scattering intensity was enhanced by methanol doping but reduced by SF<jats:sub>6</jats:sub> doping. This may be because the hydrogen-bond formation was hindered by methanol doping but promoted rather more by SF<jats:sub>6</jats:sub> doping because of the hydrophobic interaction as in clathrate hydrates. </jats:p><jats:p> PACS Nos.: 61.12Ex, 63.50tx </jats:p>",
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