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.

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 RELATIVISTIC ENERGY APPROACH AND MANY-BODY PERTURBATION THEORY TO COMPUTING ELECTRON-COLLISION CROSS-SECTIONS OF COMPLEX MULTIELECTRON IONS

2021 ◽  
pp. 102-109
Author(s):  
V. Buyadzhi
Keyword(s):  
Perturbation Theory ◽  
Cross Sections ◽  
Matrix Method ◽  
Energy Approach ◽  
Electron Collision ◽  
Relativistic Energy ◽  
Many Body ◽  
R Matrix ◽  
Collision Cross Sections ◽  
Many Body Perturbation Theory

An advanced relativistic energy approach combined with a relativistic many-body perturbation theory with ab initio zeroth approximation  is used to calculate the electron-collision excitation cross-sections for complex multielectron systems.  The relativistic many-body perturbation theory is used alongside the gauge-invariant scheme to generate an optimal Dirac-Kohn-Sham- Debye-Hückel one-electron representation.  The results of relativistic calculation (taking into account the exchange and correlation corrections) of the electron collision cross-sections of excitation for the neon-like ion of the krypton  are presented and compared with alternative results calculation on the basis of the R-matrix method in the Breit-Pauli approximation, in the relativistic distorted wave approximation and R- matrix method in combination with Dirac-Fock approximation

Methods of Measuring Electron–Atom Collision Cross Sections with an Atom Trap

2002 ◽  
pp. 357-390 ◽  
Author(s):  
R.S. Schappe ◽  
M.L. Keeler ◽  
Todd A. Zimmerman ◽  
M. Larsen ◽  
Paul Feng ◽  
...  
Keyword(s):  
Cross Sections ◽  
Atom Trap ◽  
Electron Atom ◽  
Collision Cross Sections ◽  
Atom Collision
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