These proceedings contain the invited papers, both theoreticaland experimental presented at this symposium, the first of 3 heldin Copenhagen to honour Niels Bohr's hundredth birthday.
| Title | : | Semiclassical Descriptions of Atomic and Nuclear Collisions (Niels Bohr Centennial Conferences/1985) |
| Author | : | Jens Bang |
| Language | : | en |
| Rating | : | 4.90 out of 5 stars |
| Type | : | PDF, ePub, Kindle |
| Uploaded | : | Apr 11, 2021 |
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Purchase semiclassical descriptions of atomic and nuclear collisions - 1st edition.
Citeseerx - document details (isaac councill, lee giles, pradeep teregowda): a semi-classical, many-body atomic model incorporating a momentum-dependent heisenberg core to stabilize atomic electrons is used to study antiproton capture on helium.
A common approach is to describe the active electron in a complex atom in terms of a quasi-hydrogen-like model.
Book • 1985 select semiclassical description of scattering by atoms and by atomic strings.
This chapter starts from the lorentz oscillator model then discusses the optical transitions in semiconductors. After an introduction of wannier-mott and frenkel excitons, the hopfield equations are used to describe exciton-polaritons in bulk crystals. The non-local dielectric response theory is used to describe the optical response of semiconductor quantum wells, wires, and dots.
For decades, many questions had been asked about atomic characteristics. From their sizes to their bohr's model is what we call semiclassical.
Abstract recent progress in the development of semiclassical methods to describe quantum effects in molecular dynamics is reviewed. Focusing on rigorous semiclassical methods that are based on the initial-value representation of the semiclassical propagator, we discuss several promising schemes that have been developed in the past few years to extend the applicability of semiclassical.
Dom nguez-adame gisc, departamento de f sica de materiales, universidad complutense, e-28040 madrid, spain e-mail: adame@fis. Electrons moving in a tilted periodic potential perform a periodic motion, known as bloch oscillation.
A detailed theoretical investigation of the reflection of an atomic de broglie wave at an evanescent wave mirror is presented. The classical and the semiclassical descriptions of the reflection.
Although the absorber is a single atom, the semiclassical prediction might well such theories into the classical mold; they describe non- classical effects such.
In recent years there has been renewed interest in semiclassical methods of modeling atomic structure and collision dynamics. A class of many-body models applied to these problems are descendants of the original work by kirschbaum and wilets [phys. A 21, 834 (1980)], who used momentum dependent pseudopotentials to exclude particles from quantum mechanically forbidden regions of phase.
Jul 31, 2018 atomic theory is a scientific description of the nature of atoms and matter.
Semiclassical theory of molecular collisions: real and complex-valued classical trajectories for collinear atom morse oscillator collisions.
Semiclassical hfi description is applicable to calculating the integral cidnp effect in weak fields. The hfi has been calculated for radicals with sufficiently numerous magnetically equivalent nuclei (n greater than or equal to 5) in satisfactory agreement with cidnp calculations based on quantum-mechanical description of radical-pair spin dynamics.
Apr 26, 2018 a variety of different models have been used over the past decades to speculate on how an atom works and what particles it contains.
May 5, 2005 we used the hk approximation as a starting point for describing a variety of alternative ivr treatments, both for the propagator and for other.
A semiclassical radiation theory is developed in which the spontaneous emission field of a two‐level atom is a quantum entity represented by atomic operators acting in the hilbert space of the atomic states.
The quantum kinetic equation describing slow atomic motion in laser light is derived by an operatorial method which provides mathematical.
Download citation semiclassical description of multiphoton processes we analyze strong field atomic dynamics semiclassically, based on a full time-dependent description with the hermann-kluk.
This expanded and updated well-established textbook contains an advanced presentationof quantum mechanics adapted to the requirements of modern atomic physics. Itincludes topics of current interest such as semiclassical theory, chaos, atom optics andbose-einstein condensation in atomic gases.
Semiclassical description of antiproton capture on atomic helium. (pmid:9909927) atomic, molecular, and optical physics [01 oct 1993, 48(4):2779-2785].
Theoretical description of light-matter interaction based on classical and semiclassical models; introduction of rabi oscillations, development and interpretation.
This lecture will cover the history of development of the atomic theory, atomic structure, chemical symbolism and calculations of atomic mass.
We extend the semiclassical description of two-state atomic collisions to low energies for which the impact parameter treatment fails.
Cal discharge or whatever) and describe it through a suitable pumping parameter in this point, the consideration of two-, three- or four-level atomic schemes.
We extend the semiclassical description of two–state atomic collisions to low energies for which the impact parameter treatment fails. The problem reduces to solving a system of first–order differential equations with coefficients whose semiclassical asymptotes experience the stokes phenomenon in the complex coordinate plane.
Atomic wave packet incident on an evanescent wave mirror is discussed.
Title: semiclassical description of the kinematically complete experiments.
A semiclassical, many-body atomic model incorporating a momentum-dependent heisenberg core to stabilize atomic electrons is used to study antiproton capture on helium.
Here we discuss the main features of this revised model of a semiclassical molecular target, and use it to examine antiproton collisions with h 2; details of the collision process are presented, including the energy and angular momentum states of incident antiprotons which result in formation of pp̄, and the resulting distribution of protonium atomic states.
An accurate description of quantum effects in poly-atomic molecular system is a challenging task in chemical reaction dynamics. Though considerable progress has been made in the recent years on rigorous quantum-mechanical methods,1 they are at present only applicable to relatively small molecular systems.
Understand, all-analytical semiclassical theory for nanolasers by taking into account the energy exchange between active materials and fields, power density conservation, spontaneous emission, and stimulated emission. The theory starts from the basic atomic rate equation in association with the classical.
Zeitschrift für physik a atomic nuclei december 1988 volume 331, issue 4 pp 381–389 cite as semiclassical description of isoscalar giant multipole resonances.
The density functional method for a system of electrons in an external field is applied to derive an expression for the correction to the free energy for a small change in electron density. This expression is used for a semiclassical description of shell effects in atomic clusters at both zero and finite temperatures.
Jun 5, 2012 a two-level atom description is valid if the two atomic levels involved are resonant or nearly resonant with the driving field, while all other levels.
In atomic physics, the bohr model or rutherford–bohr model, presented by niels bohr and ernest rutherford in 1913, is a system consisting of a small, dense nucleus surrounded by orbiting electrons—similar to the structure of the solar system, but with attraction provided by electrostatic forces in place of gravity.
Describe absorption and stimulated emission, two of the three basic building by dodd and his colleagues in atomic spectroscopy for which semiclassical.
Semiclassical description of shell effects in atomic clusters 77 principal quantum number and characterizes the distri- b ution of the single-electron levels in small clusters.
The parameters of the rational functional are obtained from the semiclassical description of atomic systems, resulting in a well-performing functional for simple solids. We study the limit of large atomic numbers, large-z limit, for the ionization potential of atoms and lattice constants of simple solids.
Physics of atomic nuclei november 2011 volume 74, issue 11 pp 1655–1661 cite as semiclassical description of tri asymmetry in ternary fission induced by cold polarized neutrons.
They are of course essential for the description of a laser system. We will show later that the semi-classical model based on the optical bloch equations.
We analyze strong field atomic dynamics semiclassically, based on a full time-dependent description with the hermann-kluk propagator. From the properties of the exact classical trajectories, in particular the accumulation of action in time, the prominent features of above-threshold ionization and higher-harmonic generation are proven to be interference phenomena.
A two-level atom description is valid if the two atomic levels involved are resonant or nearly resonant with the driving field, while all other levels are highly detuned. Under certain realistic approximations, it is possible to reduce this problem to a form which can be solved exactly; allowing essential features of the atom-field interaction.
(bohr atom/ density function/two-electron atoms/exchange energy).
Pdf semiclassical theory of helium atom refers to a description of the quantum spectrum of helium in terms of the underlying classical dynamics of the find.
The description of multi-electron atoms therefore we start by giving a simple order of magnitude estimate based on the semi-classical bohr model, and then.
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