کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1826115 | 1526468 | 2010 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microscopic model for the neutron dynamic structure factor of solid methane in phase II
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
فیزیک و نجوم
ابزار دقیق
پیش نمایش صفحه اول مقاله
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چکیده انگلیسی
We have constructed a microscopic model for the neutron dynamic structure factor S(Q,Ï) of solid methane in phase II. We expect this model to apply for neutron energies below 1Â eV at pressures near 1Â bar and temperatures below 20Â K where methane possesses both free rotation and hindered rotation modes of the tetrahedral molecules in the unit cell. The model treats the motions of molecular translations, intra-molecular vibrations and the free and hindered rotations of methane molecule as independent. Total scattering cross-sections calculated from the model agree with the cross-section measurements for incident neutron energies of 0.5Â meV-1Â eV. The effective density of states is extracted from the model. We also present the quantitative calculation of the separate contributions of the two different rotational modes to the inelastic cross-section for different methane temperatures in phase II.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment - Volume 620, Issues 2â3, 11â21 August 2010, Pages 382-390
Journal: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment - Volume 620, Issues 2â3, 11â21 August 2010, Pages 382-390
نویسندگان
Yunchang Shin, W. Mike Snow, C.Y. Liu, C.M. Lavelle, David V. Baxter,