التفاصيل البيبلوغرافية
| العنوان: |
Single particle dynamics in fluid and solid hydrogen sulphide: An inelastic neutron scattering study. |
| المؤلفون: |
Andreani, C., Degiorgi, E., Senesi, R., Cilloco, F., Colognesi, D., Mayers, J., Nardone, M., Pace, E. |
| المصدر: |
Journal of Chemical Physics; 1/1/2001, Vol. 114 Issue 1, 5 Charts, 7 Graphs |
| مصطلحات موضوعية: |
HYDROGEN, HYDROGEN sulfide, NEUTRON scattering |
| مستخلص: |
Inelastic neutron scattering experiments were performed at intermediate and high momentum transfer, up to 88.2 Å[sup -1], to study the temperature dependence of single hydrogen mean kinetic energy in polycrystalline and liquid hydrogen sulphide (H[sub 2]S), in the temperature range 16-206 K. Values of the hydrogen mean kinetic energy were extracted, within the impulse approximation, by fitting to the high momentum transfer data a model response function, obtained from a momentum distribution which is the orientational average of a multivariate Gaussian function. The extracted kinetic energies are compared with a harmonic model for the vibrational and roto-translational dynamics. The model makes use of the hydrogen-projected density of states worked out from intermediate momentum transfer data, as well as of optical frequencies determined from Raman and infrared (IR) spectroscopy. A fairly good agreement is obtained in the whole temperature range, while noticeably lower values for the kinetic energy are found if a single atom momentum distribution of isotropic Gaussian shape is assumed in the model response function. © 2001 American Institute of Physics. [ABSTRACT FROM AUTHOR] |
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| قاعدة البيانات: |
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