Polaron and bipolaron tendencies in a semiclassical model for hole-doped bismuthates

Thermal expansion measurements have been performed on a uvarovite rich garnet sample for the first time and compared with the expansion data on grossular and pyrope-rich garnets reported in the literature. A semiclassical model has been used to analyze the data and to obtain various thermodynamic parameters. Using these parameters, the lattice specific heat and the corresponding entropy have also been calculated.

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Effect of the lifetime of the intermediate 5Li state in the 6Li(3He, αp)4He reaction

Canadian Journal of Physics ◽

10.1139/p68-575 ◽

1968 ◽

Vol 46 (20) ◽

pp. 2241-2251 ◽

Cited By ~ 7

Author(s):

M. A. Reimann ◽

P. W. Martin ◽

E. W. Vogt

Keyword(s):

Dimensional Analysis ◽

Energy Dependence ◽

Ground State ◽

Intermediate State ◽

Two Dimensional ◽

Short Life ◽

Semiclassical Model ◽

Analysis Technique ◽

The Asymmetry

A cylindrical asymmetry about the direction of motion of 5Li has been seen in the breakup of the ground state of this nucleus observed as an intermediate state in the reaction 6Li(3He, pα)4He. Measurements were made at bombarding energies of 1.00, 1.25, and 1.50 MeV with isotopically enriched LiF targets using a two-dimensional analysis technique. We explain both the rough magnitude of the asymmetry and its qualitative energy dependence in terms of a simple semiclassical model. In this model the origin of the asymmetry is associated with the short life of the 5Li intermediate state and with the memory retained by the proton during this short life of its "localization" at the time of formation of 5Li.

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Semiclassical model for δ-electron emission from multielectronic atoms

Physics Letters A ◽

10.1016/0375-9601(93)90159-w ◽

1993 ◽

Vol 173 (6) ◽

pp. 469-472

Author(s):

S.A. Gerasimov

Keyword(s):

Electron Emission ◽

Semiclassical Model

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Classical Chaos Described by a Density Matrix

Physics ◽

10.3390/physics3030045 ◽

2021 ◽

Vol 3 (3) ◽

pp. 739-746

Author(s):

Andres Mauricio Kowalski ◽

Angelo Plastino ◽

Gaspar Gonzalez

Keyword(s):

Density Matrix ◽

Pure State ◽

Classical Limit ◽

Degrees Of Freedom ◽

Temporal Evolution ◽

Entropy Density ◽

State Density ◽

Unexpected Result ◽

Semiclassical Model ◽

Classical Chaos

In this paper, a reference to the semiclassical model, in which quantum degrees of freedom interact with classical ones, is considered. The classical limit of a maximum-entropy density matrix that describes the temporal evolution of such a system is analyzed. Here, it is analytically shown that, in the classical limit, it is possible to reproduce classical results. An example is classical chaos. This is done by means a pure-state density matrix, a rather unexpected result. It is shown that this is possible only if the quantum part of the system is in a special class of states.

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