Light polarization effects in laser-assisted (e,2e) collisions in helium

Makhoute, A.; Khalil, Diaa; Maquet, Alfred; Joachain, Charles; Taïeb, Richard

doi:10.1088/0953-4075/32/13/314

Cited by 31 publications

(22 citation statements)

References 13 publications

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“…The electromagnetic field can act as a reservoir of energy and its polarization vector introduces a new axis of symmetry. As a result, the (e,2e) cross sections for laser assisted collisions differ strongly in shape and magnitude from the field free cross sections as predicted in several theoretical papers on this topic (Khalil et al 1997, Makhoute et al 1999. On the other hand little is known about the validity and the accuracy of these treatments simply due to the lack of experimental data.…”

Section: Laser Assisted Collisionsmentioning

confidence: 93%

Recoil-ion and electron momentum spectroscopy: reaction-microscopes

et al. 2003

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Recoil-ion and electron momentum spectroscopy is a rapidly developing technique that allows one to measure the vector momenta of several ions and electrons resulting from atomic or molecular fragmentation. In a unique combination, large solid angles close to π Microccopes -the "bubble chambers of atomic physics" -mark the decisive step forward to investigate many-particle quantum-dynamics occurring when atomic and molecular systems or even surfaces and solids are exposed to time-dependent external electromagnetic fields.The present review concentrates on just these latest technical developments and on at least four new classes of fragmentation experiments that have emerged within about the last five years. First, multi-dimensional images in momentum space brought unprecedented information on the dynamics of single-photon induced fragmentation of fixed-in-space molecules and on their structure. Second, a break-through in the investigation of highintensity short-pulse laser induced fragmentation of atoms and molecules has been achieved by using Reaction Microccopes. Third, for electron and ion-impact, the investigation of twoelectron reactions has matured to a state such that first fully differential cross sections (FDCS) are reported. Forth, comprehensive sets of FDCS for single ionisation of atoms by ion-impact, the most basic atomic fragmentation reaction, brought new insight, a couple of surprises and unexpected challenges to theory at keV to GeV collision energies. In addition, a brief summary on the kinematics is provided at the beginning. Finally, the rich future potential of the method is shortly envisaged.2

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Section: Laser Assisted Collisionsmentioning

confidence: 93%

Recoil-ion and electron momentum spectroscopy: reaction-microscopes

et al. 2003

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“…enhancement or diminution of the peak just seems to be reversed! It would be interesting to compare our experimental data with the results of more refined non-perturbative calculations taking target polarization or dressing of the initial state into account [24][25][26][27][28].…”

Section: Finally We Present Triply Differential Cross Sections Tdcsmentioning

confidence: 99%

Electron Impact Ionization in the Presence of a Laser Field: A Kinematically Complete(nγe,2e)Experiment

et al. 2005

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Single ionization of He by 1 keV electron impact in the presence of an intense (I=4×10 12 W/cm 2 ) laser field (λ=1064 nm) has been explored in a kinematically complete experiment using a "Reaction Microscope". Distinct differences in the singly to fully differential cross sections compared to the field-free situation are observed which cannot be explained by a first-order quantum calculation.Major features, such as the number of photons exchanged and the modification of the energy spectrum of emitted electrons can be qualitatively understood within a simple classical picture.

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“…This expression can be extended to the domain of higher frequencies ( E k e w > ) by using the closure approximation [31]. We obtain The S-matrix element for the electron-impact laserassisted ionization of atomic hydrogen from its ground state, in the direct channel and in the FBA is then given by r r r r r r…”

Section: Theorymentioning

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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Light polarization effects in laser-assisted (e,2e) collisions in helium

Cited by 31 publications

References 13 publications

Recoil-ion and electron momentum spectroscopy: reaction-microscopes

Recoil-ion and electron momentum spectroscopy: reaction-microscopes

Electron Impact Ionization in the Presence of a Laser Field: A Kinematically Complete(nγe,2e)Experiment

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

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