Influence of laser properties on particle-atom ionising collisions

Zangara, Rosalia; Cavaliere, P.; Leone, Cláudio; Ferrante, G.

doi:10.1088/0022-3700/15/21/012

Cited by 27 publications

(10 citation statements)

References 14 publications

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“…In fact, the first and second Born amplitudes of Eqs. (17) and (23) depend on the laser polarization direction via the argument X of the Bessel functions, i.e., via the scalar products ao • A and a () • ki,. In a more physical perspective, the scalar product a0 • A can be associated to the coupling of the laser field with the scattered electron which experiences the momentum change A during the course of the collision, while the scalar product ao • k/, corresponds to the coupling of the laser field with the ejected electron.…”

Section: Resultsmentioning

confidence: 99%

“…In the past few years, there has been particular interest for the study of (e, 2e) processes in the low-incident-energy regime in coplanar symmetric geometry [17][18][19][20]. A number of theoretical calculations [21][22][23][24][25][26][27][28][29] exist in the literature for the laser-assisted (e, 2e) process of hydrogen and helium atoms, prior to the first realization of the kinematically complete experiment of Hohr et al [30] for the laser-assisted single ionization of a helium atom.…”

Section: Introductionmentioning

confidence: 99%

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Exchange effects and second-order Born corrections in laser-assisted(e,2e)collisions with helium atoms

et al. 2015

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The triple differential cross section for laser-assisted ionization of a helium target by slow electrons is analyzed within the framework of the second Born approximation. We evaluate the S-matrix elements using Volkov and Coulomb-Volkov wave functions for describing the continuum states of the scattered and the ejected electrons, respectively. The required scattering amplitudes are performed by expanding the atomic wave functions onto a complex-scaled Sturmian basis, which allows us to exactly take into account the contribution of the continuous spectrum to the dressing of the atomic states. Our results have been improved by taking into account exchange effects. Furthermore, the second-order Born correction is seen to be important and significantly affects the magnitudes of the binary and recoil peaks.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Exchange effects and second-order Born corrections in laser-assisted(e,2e)collisions with helium atoms

et al. 2015

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“…Figure 3 shows TDCS in the case ℓ 1 = corresponding to the net absorption of one photon. The complete results obtained by using the ionization amplitude equation (18) in the FBA are compared with those obtained by neglecting the dressing of the atomic target (the electronic amplitude f 1 ). It is interesting to note that at low frequencies, the target dressing is less important and one can model the atom by a structureless center of force.…”

Section: =´-)mentioning

confidence: 99%

“…to enhance or suppress the ionization cross section as per the requirement in a particular physical process. Since the laser field can act as a reservoir of energy and its polarization vector introduces a new axis of symmetry, the laser-assisted ionization cross sections could differ strongly in shape and magnitude from the field-free cross sections as predicted in several theoretical studies on this topic [18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Laser-assisted coplanar symmetric (e, 2e) triple differential cross sections

Khalil¹,

Tlidi

Makhoute

et al. 2017

J. Phys. B: At. Mol. Opt. Phys.

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The second Born approximation in laserassisted (e, 2e) collisions in hydrogen I Ajana, A Makhoute, D Khalil et al. AbstractThe modification due to an external linearly polarized monochromatic laser field on the dynamics of the ionization process of an atomic hydrogen by electron-impact is studied theoretically for a coplanar symmetric geometry. The interaction of the laser field with the unbound electrons is treated in a non-perturbative way. The wave functions of the ingoing and outgoing electrons in the laser field are treated as non-relativistic Volkov waves, while the interaction of the bound electron with the laser field is treated by using first-order perturbation theory, assuming that the electric field strength associated with the external laser field is much less than the atomic unit e a 5 10 V cm 2 9 1 =´-. The influence of the laser parameters on the angular distribution is analyzed and several illustrative examples are discussed. Significant changes are noted both in the shape and magnitude of the triple differential cross sections (TDCS) by the application of the laser field. Numerical results show that the TDCS are strongly dependent on the dressing of the projectile by the laser field at low frequency in (e, 2e) spectroscopy region.

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“…This topic has come under active investigation in the last few years (for some recent work see Rahman and Faisal 1978, Cavaliere et al 1980, 1981, Mohan 1980, Banerji and Mittleman 1981, Mathur 1981, Daniele and Ferrante 1982, Zangara et al 1982, Pundir and Mathur 1982, Zarcone et a1 1983, Fiordilino and Mittleman 1983, Prasad and Unnikrishnan 1983.…”

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confidence: 99%