scholarly journals Study of the Dressed State of Hydrogen Atom in Electron Atom Elastic Collision in Laser Field

2020 ◽  
Vol 6 (2) ◽  
pp. 149-157
Author(s):  
K. Yadav ◽  
S. P. Gupta ◽  
J. J. Nakarmi
Keyword(s):  
Momentum Transfer ◽  
Laser Field ◽  
Scattering Matrix ◽  
Weak Field ◽  
Elastic Collision ◽  
Target Atom ◽  
Electron Atom ◽  
Dressed States ◽  
Atomic States ◽  
Very High

We discuss the various important aspects of the theory of electron-atom elastic collision in laser field. We analyze the collision accompanied by the transfer of  photons. We study the free electron states i.e. Volkov states and target atomic states i.e. Dressed states. We calculate the first-Born scattering matrix for electron-atom elastic collision. The present work accounts the calculation for hydrogen as target atom in soft photon limits i.e., in weak field. The dressing effect becomes significant in the region of low momentum transfer, reaches maximum of value of 25000 a.u. at momentum transfer of 0.44. This work explains that the differential cross-section does not occur very low and at very high momentum transfer. However, it occurs at moderate momentum transfer.

scholarly journals Laser-Assisted Electron-Atom Collisions

1991 ◽  
Vol 11 (3-4) ◽  
pp. 273-277
Author(s):  
C. J. Joachain
Keyword(s):  
Internal Structure ◽  
Cross Sections ◽  
Laser Field ◽  
Perturbative Approach ◽  
R Matrix ◽  
Theoretical Methods ◽  
Electron Atom ◽  
Floquet Method ◽  
Collision Cross Sections ◽  
Atomic States

The theoretical methods which have been developed to analyze laser-assisted electron-atom collisions are reviewed. Firstly, the scattering of an electron by a potential in the presence of a laser field is considered. The analysis is then generalized to laser-assisted collisions of electrons with “real” atoms having an internal structure. Two methods are discussed: a semi-perturbative approach suitable for fast incident electrons and a fully non-perturbative theory—the R-matrix-Floquet method—which is applicable to the case of slow incident electrons. In particular it is shown how the dressing of the atomic states by the laser field can affect the collision cross sections.

Electron-atom potential scattering assisted by a bichromatic elliptically polarized laser field

2017 ◽  
Vol 71 (10) ◽  
Author(s):  
Arman Korajac ◽  
Dino Habibović ◽  
Aner Čerkić ◽  
Mustafa Busuladžić ◽  
Dejan B. Milošević
Keyword(s):  
Laser Field ◽  
Potential Scattering ◽  
Electron Atom ◽  
Elliptically Polarized ◽  
Atom Potential

Effects of a laser field on electron-atom ionizing collisions

1981 ◽  
Vol 24 (2) ◽  
pp. 910-913 ◽  
Author(s):  
P. Cavaliere ◽  
C. Leone ◽  
R. Zangara ◽  
G. Ferrante
Keyword(s):  
Laser Field ◽  
Electron Atom

scholarly journals Interference of a resonance state with itself: a route to control its dynamical behaviour

2020 ◽  
Vol 22 (26) ◽  
pp. 14637-14644
Author(s):  
A. García-Vela
Keyword(s):  
Laser Field ◽  
Quantum Interference ◽  
Dynamical Behavior ◽  
Resonance State ◽  
Weak Field ◽  
Dynamical Behaviour ◽  
State Distribution ◽  
Decay Lifetime

It is demonstrated both numerically and mathematically that the dynamical behavior of an isolated resonance state (the decay lifetime and the asymptotic fragment state distribution), can be extensively controlled by means of quantum interference induced by a laser field in the weak-field regime.

Calculation of the singlet–triplet energy differences using the universal function

1996 ◽  
Vol 74 (5-6) ◽  
pp. 279-281 ◽  
Author(s):  
Zhifan Chen ◽  
Alfred Z. Msezane
Keyword(s):  
Experimental Data ◽  
Momentum Transfer ◽  
Oscillator Strength ◽  
Energy Difference ◽  
Cubic Spline ◽  
Universal Function ◽  
Triplet Energy ◽  
Electron Atom ◽  
Generalized Oscillator ◽  
Molecule Scattering

A method to calculate the singlet–triplet energy differences in electron–atom (molecule) scattering is developed. The method uses the recently developed universal function, which can extrapolate the generalized oscillator strength through the nonphysical region to K2 (momentum transfer squared) = 0, to calculate the integral of the energy difference in the small K2 region. Cubic spline is used for the experimental data to evaluate the contribution to the integral numerically. The energy differences in the transitions 11S–21,3P in e–He and X1 Σ+–A1,3 Π in e–CO scattering are calculated and compared with measurements as illustrative examples.

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