78,088 research outputs found
Dispersion of Klauder's temporally stable coherent states for the hydrogen atom
We study the dispersion of the "temporally stable" coherent states for the
hydrogen atom introduced by Klauder. These are states which under temporal
evolution by the hydrogen atom Hamiltonian retain their coherence properties.
We show that in the hydrogen atom such wave packets do not move
quasi-classically; i.e., they do not follow with no or little dispersion the
Keplerian orbits of the classical electron. The poor quantum-classical
correspondence does not improve in the semiclassical limit.Comment: 6 pages, 2 figure
Hydrogen atom in phase space: The Wigner representation
We have found an effective method of calculating the Wigner function, being a
quantum analogue of joint probability distribution of position and momentum,
for bound states of nonrelativistic hydrogen atom. The formal similarity
between the eigenfunctions of nonrelativistic hydrogen atom in the momentum
representation and Klein-Gordon propagators has allowed the calculation of the
Wigner function for an arbitrary bound state of the hydrogen atom. These Wigner
functions for some low lying states are depicted and discussed.Comment: 8 pages (including figures
Chemical Reaction between Single Hydrogen Atom and Graphene
We study chemical reaction between a single hydrogen atom and a graphene,
which is the elemental reaction between hydrogen and graphitic carbon
materials. In the present work, classical molecular dynamics simulation is used
with modified Brenner's empirical bond order potential. The three reactions,
that is, absorption reaction, reflection reaction and penetration reaction, are
observed in our simulation. Reaction rates depend on the incident energy of the
hydrogen atom and the graphene temperature. The dependence can be explained by
the following mechanisms: (1) The hydrogen atom receives repulsive force by
pi-electrons in addition to nuclear repulsion. (2) Absorbing the hydrogen atom,
the graphene transforms its structure to the ``overhang'' configuration such as
sp-3 state. (3) The hexagonal hole of the graphene is expanded during the
penetration of the hydrogen atom.Comment: 10 pages, 9 figures. This paper was submitted to PR
The hydrogen atom in electric and magnetic fields : Pauli's 1926 article
The results obtained by Pauli, in his 1926 article on the hydrogen atom, made
essential use of the dynamical so(4) symmetry of the bound states. Pauli used
this symmetry to compute the perturbed energy levels of an hydrogen atom in a
uniform electric field (Stark effect) and in uniform electric and magnetic
fields. Although the experimental check of the single Stark effect on the
hydrogen atom has been studied experimentally, Pauli's results in mixed fields
have been studied only for Rydberg states of rubidium atoms in crossedfields
and lithium atoms in parallel fields.Comment: 11 pages, latex file, 2 figure
Is Schr\"{o}dinger's Conjecture for the Hydrogen Atom Coherent States Attainable
We construct the most general SO(4,2) hydrogen atom coherent states which are
the counterpart of Schr\"{o}dinger's harmonic oscillator coherent states. We
show that these states cannot be localized and cannot follow the classical
orbits. Thus, Schr\"{o}dinger's conjecture for the hydrogen atom coherent
states is unattainable.Comment: 10 pages, report
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