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The interaction between diatomic molecules and rare gas atoms can be described by the realistic, though simplified potentialV=?[(rm/r)12(1 +q12P2(cosθ))?2(rm/r)6(1+q6P2(cosθ))] The determination of the parameters?, r m andq 6has been treated in the two previous parts of this series. The present final paper describes the determination of the anisotropy parameter in the repulsive part of the potential, q12, for the system CsF-He. Whileq 6 could be derived using only the dependence of the total scattering cross section on the molecular rotational state, the determination ofq 12 requires, in addition, knowledge of the velocity dependence. The comparison of the experimental data for CsF in the rotational states ¦J, M〉=¦1, 1〉 and ¦1, 0〉 with cross sections calculated by means of the “high energy” approximation yields the result:q 12=0.9±0.2. The validity of the “high energy” approximation in the velocity range covered by the experiment is discussed. 相似文献
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Measurement of the total scattering cross section for 4He4He at very low energies are presented. The measurements have resolved the atomic Ramsauer—Townsend effect. 相似文献
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Christer Bennewitz 《Communications in Mathematical Physics》2001,218(1):131-132
In [2], [5] a “local” version of a basic uniqueness theorem in inverse spectral theory is given. This paper gives a simple
proof of this theorem.
Received: 6 November 2000 / Accepted: 8 November 2000 相似文献
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Gnecco E Bennewitz R Gyalog T Loppacher C Bammerlin M Meyer E Guntherodt H 《Physical review letters》2000,84(6):1172-1175
Sliding friction between the tip of a friction force microscope and NaCl(100) was studied to deduce the velocity dependence of friction forces on the atomic scale. A logarithmic dependence of the mean friction force is revealed at low velocities. The experimental data are interpreted in terms of a modified Tomlinson model which is based on reaction rate theory. 相似文献
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The attempt has been made by several authors to clear up the discrepancy between van der Waals constants determined from scattering cross sections for thermal energies and theoretical values using measured oscillator strengths. The present paper discusses three sources of error not accounted for properly in the earlier work. The appropriate corrections discussed in this paper lead to a satisfactory agreement between experiment and theory. 相似文献