Uncertainty products for the anharmonic morse oscillator (original) (raw)

1980, Lettere Al Nuovo Cimento

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Abstract

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The paper presents a comprehensive analysis of the position-momentum uncertainty relations for the anharmonic Morse oscillator. By extending the concept of coherent states, the authors provide general analytic expressions that characterize uncertainty products in quantum systems with anharmonic potentials. The derived expressions are pertinent not only for understanding quantum mechanics but also for applications in molecular rotation-vibration coupling.

Generalized and Gaussian coherent states for the Morse potential

Journal of Physics A: Mathematical and Theoretical, 2008

In this paper, we will consider one-dimensional anharmonic oscillator, which represents well the anharmonic vibrations in diatomic molecules. For the description of the associate potential we shall use the Morse potential, which gives a good approximation of the experimentally observed vibrational modes of molecules and hence contributes to the realistic description of the spectrum of diatomic molecules. Generalized and gaussian coherent states are thus constructed and compared in terms of the localisation of the particle in those states. We apply these results to the example of the sodium chloride molecule 1 H 35 Cl.

Quasi-bound states of coupled Morse oscillators

Chemical Physics Letters, 1985

Two different methods for approximating these as local&d states are compared. The algebraic approach is shown to be in very good accord with-the other method which is formulated in coordinate space and hence is differential in character. For these highly excited states an intennul~plet mixing term is included in the algebraic Hamiltoniau + For the technical def?nit%on of "compact" and other group theoretic terms. see ref. [ 131. 0 009-2614/85/Z% 03.30 0 Ekevier Science Publishers B-V.

Gazeau–Klauder quasi-coherent states for the Morse oscillator

Physics Letters A, 2003

In the Letter, we have constructed and investigated some properties of the Gazeau-Klauder quasi-coherent states for the Morse potential, previously deduced by Roy and Roy. We have focused our attention on the thermal states and we have found the analytical form for the diagonal P -representation of the density operator.

The algebraic approach to the Morse oscillator

Journal of Physics A: Mathematical and General, 1980

The eigenfunctions and eigenvalues of the Schrödinger equation with a ring-shaped non-spherical oscillator are obtained. A realization of the ladder operators for the radial wave functions is studied. It is found that these operators satisfy the commutation relations of an SU(1, 1) group. The closed analytical expressions for the matrix elements of different functions ρ and ρ d dρ with ρ = r 2 are evaluated.  2004 Published by Elsevier B.V.

Comments on “Gazeau–Klauder coherent states for trigonometric Rosen–Morse potential” [J. Math. Phys. 49, 022104 (2008)]

Journal of Mathematical Physics, 2008

In a recently published paper in this journal ͓A. Cheaghlou and O. Faizy, J. Math. Phys. 49, 022104 ͑2008͔͒, the authors introduce the Gazeau-Klauder coherent states for the trigonometric Rosen-Morse potential as an infinite superposition of the wavefunctions. It is shown that their proposed measure to realize the resolution of the identity condition is not positive definite. Consequently, the claimed coherencies for the trigonometric Rosen-Morse wavefunctions cannot actually exist.

Coherent states for PT-/non-PT-symmetric and non-Hermitian Morse potentials via the path integral method

Physica Scripta, 2010

We discuss the coherent states for PT-/non-PT-Symmetric and non-Hermitian generalized Morse Potential obtained by using path integral formalism over the holomorphic coordinates. We transform the action of generalized Morse potential into two harmonic oscillators with a new parametric time to establish the parametric time coherent states. We calculate the energy eigenvalues and the corresponding wave functions in parabolic coordinates.

Simple evaluation of Franck-Condon factors and non-Condon effects in the Morse potential

International Journal of Quantum Chemistry, 2002

The calculation of Franck-Condon factors between different one-dimensional Morse potential eigenstates using a formula derived from the Wigner function is discussed. Our numerical calculations using a very simple program written in Mathematica is compared with other calculations. We show that our results have a similar accuracy as the calculations performed with more sophisticated methods. We discuss the extension of our method to include non-Condon effects in the calculation.

From the generalized Morse potential to a unified treatment of the D-dimensional singular harmonic oscillator and singular Coulomb potentials

Journal of Mathematical Chemistry, 2016

Bound-state solutions of the singular harmonic oscillator and singular Coulomb potentials in arbitrary dimensions are generated in a simple way from the solutions of the one-dimensional generalized Morse potential. The nonsingular harmonic oscillator and nonsingular Coulomb potentials in arbitrary dimensions with their additional accidental degeneracies are obtained as particular cases. Added bonuses from these mappings are the straightforward determination of the critical attractive singular potential, the proper boundary condition on the radial eigenfunction at the origin and the inexistence of bound states in a pure inversely quadratic potential.

Analytical expressions for vibrational matrix elements of Morse oscillators

Physical Review A, 1988

Several exact recursion relations connecting different Morse oscillator matrix elements associated with the operators q e~' and q e~'(d/dr} are derived. Matrix elements of the other useful operators may then be obtained easily. In particular, analytical expressions for (y"d/dr) and [y "d /dr +(d/dr)y "], matrix elements of interest in the study of the internuclear motion in polyatomic molecules, are obtained.

Method for calculating analytical solutions of the Schrödinger equation: Anharmonic oscillators and generalized Morse oscillators

Physical Review A, 1996

A method for calculating the analytical solutions of the one-dimensional Schrödinger equation is suggested. A general discussion of the possible forms of the potentials and wave functions that are necessary to get the analytical solution is presented. In general, the analytical solutions appear in multiplets corresponding to the quantum number n of the harmonic oscillator. As an application, known solutions for the anharmonic oscillators are critically recalculated and a few additional results are found. Analytical solutions are also found for the generalized Morse oscillators.

Construction of the Barut–Girardello quasi coherent states for the Morse potential

Annals of Physics, 2013

h i g h l i g h t s • Construct the coherent states of the Barut-Girardello kind (BG-CSs) for the MO potential. • They fulfil all the conditions needed to a coherent state. • Present the Mandel parameter and Husimi's and P-quasi distribution functions. • All results tend to those for the one dimensional harmonic oscillator in its harmonic limit.

Vibrational resonance in the Morse oscillator

Pramana, 2013

We investigate the occurrence of vibrational resonance in both classical and quantum mechanical Morse oscillators driven by a biharmonic force. The biharmonic force consists of two forces of widely different frequencies ω and Ω with Ω ≫ ω. In the damped and biharmonically driven classical Morse oscillator applying a theoretical approach we obtain an analytical expression for the response amplitude at the low-frequency ω. We identify the conditions on the parameters for the occurrence of the resonance. The system shows only one resonance and moreover at resonance the response amplitude is 1/(dω) where d is the coefficient of linear damping. When the amplitude of the high-frequency force is varied after resonance the response amplitude does not decay to zero but approaches a nonzero limiting value. We have observed that vibrational resonance occurs when the sinusoidal force is replaced by a square-wave force. We also report the occurrence of resonance and anti-resonance of transition probability of quantum mechanical Morse oscillator in the presence of the biharmonic external field.

Exactly Solvable Modified Morse Potentials for Quantum-Mechanical Applications

Physica Scripta, 1999

The equilibrium quasiprobability density function W (ϑ, ϕ) of spin orientations in a representation (phase) space of the polar and azimuthal angles (ϑ, ϕ) (analogous to the Wigner distribution for translational motion of a particle) is given by a finite series of spherical harmonics in the spin number and their associated statistical moments so allowing one to calculate W (ϑ, ϕ) for an arbitrary spin system in the equilibrium state described by the canonical distribution ρ = e -β Ĥ S /Tr(e -β Ĥ S ). The system with Hamiltonian Ĥ S = -γ hH • Ŝ-B Ŝ2 Z is treated as a particular example (γ is the gyromagnetic ratio, h is Planck's constant, H represents an external magnetic field and B represents an internal field parameter). For a uniaxial system with Ĥ S = -γ hH ŜZ -B Ŝ2 Z , the solution may be given in the closed form.

Statistical Properties of Klauder-Perelomov Coherent States for the Morse Potential

International Journal of Modern Physics B - IJMPB, 2004

We present in this letter a realistic construction of the coherent states for the Morse potential using the Klauder-Perelomov approach. We discuss the statistical properties of these states, by deducing the Q- and P-distribution functions. The thermal expectations for the quantum canonical ideal gas of the Morse oscillators are also calculated.

Any ℓ − states solutions of the Schrödinger equation interacting with Hellmann-generalized Morse potential model

Karbala International Journal of Modern Science, 2017

The approximate analytical solutions of the radial Schrӧdinger equation have been obtained with a newly proposed potential called Hellmann-generalized Morse potential. The potential is a superposition of Hellmann potential and generalized Morse or Deng-Fan potential. The Hellmann-generalized Morse potential actually comprises of three different potentials which includes Yukawa potential, Coulomb potential and Deng-Fan potential. The aim of combining these potentials is to have a wide application. The energy eigenvalue and the corresponding wave function are calculated in a closed and compact form using the parametric Nikiforov-Uvarov method. The energy equation for some potentials such as Deng-Fan, Rosen Morse, Morse, Hellmann, Yukawa and Coulomb potentials have also been obtained by varying some potential parameters. Some numerical results have been computed. We have plotted the behavior of the energy eigenvalues with different potential parameters and also reported on the numerical result. Finally, we computed the variance and information energy for the Hellmann-generalized Morse potential.

Erratum: Analytical expressions for vibrational matrix elements of Morse oscillators

Physical Review A, 1989

and and Eq. (37) should read 0, 1 ~v, v =~v, v -Mv, 'v (37) Also, there are several errors in Tables II, III, and IV. In these cases, the errors are too numerous, so we reproduce the tables in their entirety. These changes do not aA'ect any of the conclusions drawn in the paper. We thank Dr. N. Fahrer very much for calling our attention to some misprints and errors. 40 1688 1989 The American Physical Society 40 ERRATA 1689 TABLE II. Matrix elements of z =e '~( k =1-6). M, ', . = 1 -C+ M, ',' M0, 3 + 12(25 -3D )+5C(33D -71)+SC (2 -3D )+5C (11 -6D )+2C (3D -5) S2

An algebraic construction of the coherent states of the Morse potential based on SUSY QM

1999

By introducing the shape invariant Lie algebra spanned by the SUSY ladder operators plus the unity operator, a new basis is presented for the quantum treatment of the one-dimensional Morse potential. In this discrete, complete orthonormal set, which we call the pseudo number states, the Morse Hamiltonian is tridiagonal. By using this basis we construct coherent states algebraically for the Morse potential in a close analogy with the harmonic oscillator. We also show that there exists an unitary displacement operator creating these coherent states from the ground state. We show that our coherent states form a continuous and overcomplete set of states. They coincide with a class of states constructed earlier by Nieto and Simmons by using the coordinate representation.

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