Optothermal (bolometric) detection and a line-tunable CO 2 laser have been used, in conjunction with supersonic beams of dilute mixtures of SF 6 or CH 3 F in Ar, to obtain the infrared spectra of Ar clusters containin...
Optothermal (bolometric) detection and a line-tunable CO 2 laser have been used, in conjunction with supersonic beams of dilute mixtures of SF 6 or CH 3 F in Ar, to obtain the infrared spectra of Ar clusters containing these molecules. The spectra obtained at the limit of large clusters are remarkably similar to the infrared Ar matrix deposition spectra of the same molecules.
The laser-Stark spectrum of the ν 3 vibration of fluoromethane in a molecular beam is recorded using bolometric detection methods. The resolution of the spectra is limited by the homogeneity of the applied electric f...
The laser-Stark spectrum of the ν 3 vibration of fluoromethane in a molecular beam is recorded using bolometric detection methods. The resolution of the spectra is limited by the homogeneity of the applied electric field to one part in 3000 of the Stark shift required to tune a transition into resonance. The observation of several field induced transitions of fluoromethane is reported.
Using the Anderson model in the nonmagnetic limit, we have calculated some properties of the superconducting virtual-bound-state alloys. The calculated properties are the transition temperature Tc, the jump in specifi...
Using the Anderson model in the nonmagnetic limit, we have calculated some properties of the superconducting virtual-bound-state alloys. The calculated properties are the transition temperature Tc, the jump in specific heat at Tc, ΔC, the electronic density of states, and the tunneling conductance. Special attention is paid to the systematic variation of these properties with the resonance width Γ. It is found that the initial slope of the normalized ΔC versus the normalized Tc curve has a maximum value of 3.638, which is the highest value reported in the literature for the impurity problem. Our tunneling study suggests that for an electron-tunneling search of bound states in alloys with relatively large Γ, an ultra-low-temperature experiment is desirable.
The Shiba-Rusinov theory of magnetic impurities in a superconductor is investigated, with special attention paid to the role of the potential scattering term in the electron-impurity interaction. The meaning of Anders...
The Shiba-Rusinov theory of magnetic impurities in a superconductor is investigated, with special attention paid to the role of the potential scattering term in the electron-impurity interaction. The meaning of Anderson's theorem in the Shiba-Rusinov theory is discussed.
By the treatment of the electron-impurity scattering exactly by means of a t matrix, the effect of nonmagnetic impurities on antiferromagnetic superconductors has been investigated in detail. Our study is an extension...
By the treatment of the electron-impurity scattering exactly by means of a t matrix, the effect of nonmagnetic impurities on antiferromagnetic superconductors has been investigated in detail. Our study is an extension of the recent work of Nass, Levin, and Grest to the strong-scattering case. The appearance of bound states due to impurities for HQ>Δ is discussed (here HQ is the antiferromagnetic molecular field and Δ is the superconducting order parameter). Investigating the density of states [N(ω)], we show the growth of the "impurity band" with the increase in impurity concentration. The "dirty"-limit behavior of the system and the condition for the appearance of the gaplessness are discussed analytically.
The effect of paramagnetic impurities on superconductors with energy-gap anisotropy is studied using the Shiba-Rusinov theory and treating the ordinary and exchange interactions equally. The Abrikosov-Gor'kov-theo...
The effect of paramagnetic impurities on superconductors with energy-gap anisotropy is studied using the Shiba-Rusinov theory and treating the ordinary and exchange interactions equally. The Abrikosov-Gor'kov-theory results are a special case of our calculations. The transition temperature Tc and the jump in specific heat at Tc are calculated. The emphasis is to clarify the roles of the ordinary and the exchange interactions in the electron-impurity scattering. The difference between the results of the Shiba-Rusinov and Abrikosov-Gor'kov theories is brought out.
An accurate intermolecular potential of the HFD‐C form is proposed which appears to be the best representation of the Ar–Kr interaction. The potential, which possesses the correct long range behavior, predicts a wid...
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An accurate intermolecular potential of the HFD‐C form is proposed which appears to be the best representation of the Ar–Kr interaction. The potential, which possesses the correct long range behavior, predicts a wide variety of macroscopic and microscopic data. It is consistent with accurate second virial, viscosity, and diffusion coefficients. Differential scattering and low as well as high energy total cross section data are accurately predicted.
Literature intermolecular potentials for the Ar–Xe and Kr–Xesystems are analyzed and critically assessed as to their abilities to predict dilute gas bulk and microscopic properties. Two new potentials of the HFD‐C ...
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Literature intermolecular potentials for the Ar–Xe and Kr–Xesystems are analyzed and critically assessed as to their abilities to predict dilute gas bulk and microscopic properties. Two new potentials of the HFD‐C form (HFDAX1 and HFDKX1) are proposed for the Ar–Xe and Kr–Xe interactions, respectively, which accurately predict a large number of properties.
Thermodynamic behavior in the critical region of the spin van der Waals model is considered when the number of spins in the system is large but finite (1?N? 1 / 3), where ε=(T?T c )/T c , T c being the critical t...
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Thermodynamic behavior in the critical region of the spin van der Waals model is considered when the number of spins in the system is large but finite (1?N<∞). The specific heat curve is shown to possess a steep, yet smooth, maximum which turns into a singularity as the number of spins becomes infinite. In the case of the finite system, this maximum occurs at ε=ε*=O(N ?1/3), where ε=(T?T c )/T c , T c being the critical temperature of the infinite system.
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