Experimental Study of Photodetachment in a Strong Laser Field of Circular Polarization

Bergues, Boris; Ni, Yongfeng; Helm, H.; Kiyan, Igor Yu.

doi:10.1103/physrevlett.95.263002

Cited by 60 publications

(51 citation statements)

References 17 publications

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“…1 has support from other considerations. The momentum distribution for photoelectrons from ionization with circular polarization as given in the work of Bergues et al [14] is shown here in Fig. 5.…”

Section: Referencesmentioning

confidence: 97%

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Relativistic effects in nonrelativistic ionization

Reiss

2013

Phys. Rev. A

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Phys. Rev. Lett. 106, 193002 (2011)] in atomic ionization by circularly polarized light are readily explained by the relativistic strong-field approximation (RSFA). The physical picture that emerges is determined by linear and angular momentum properties of the photons required for ionization, and it is largely independent of the atom being ionized. Radiation pressure follows from linear momenta carried by photons, and the angular momenta of the photons require the photoelectron to be in a circular orbit around the remnant ion. Two special features of the Smeenk et al. experiments are highlighted by the analysis. One is that this is the first verification of true relativistic effects in ionization. The other is that the circular trajectory picture from the RSFA analysis directly contradicts the physical picture that emerges from the length gauge. This is an exceptionally striking example of gauge-dependent differences in physical interpretations. Nevertheless, the distribution of momentum found by the Smeenk et al. experiments is accurately predicted by the RSFA. Results herein provide a universal theory to which the analysis of Titi and Drake [A. S. Titi and G. W. F. Drake, Phys. Rev. A 85, 041404(R) (2012)] represents an approximation. The physical properties of ionization by circularly polarized light also cast doubt on some predictions of rescattering theory.

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Section: Referencesmentioning

confidence: 97%

“…5. (Color online) A momentum distribution measured by the Freiburg group [14] clearly shows the circular motion of a photoelectron produced by a circularly polarized laser beam. The propagation direction of the beam lies along the vertically oriented axis in the figure.…”

Section: Role Of the Ponderomotive Potentialmentioning

confidence: 99%

Relativistic effects in nonrelativistic ionization

Reiss

2013

Phys. Rev. A

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“…Negative ions are particularly amenable to investigation by methods based on the strong-field approximation (SFA) [55], since their neutral core dictates that the detachment dynamics is influenced by short-range interactions alone. Investigations on the response of negative ions to circularly-polarized fields are becoming more prevalent [52,57,58]. Additionally, recent SFA calculations of photoelectron momentum distributions for F − , subject to orthogonal laser fields, have shown good agreement with those obtained by solving the time-dependent Schrödinger equation within the SAE approximation [59].…”

Section: Introductionmentioning

confidence: 98%

Electron rotational asymmetry in strong-field photodetachment from F− by circularly polarized laser pulses

Armstrong¹,

Clarke²,

Brown³

et al. 2019

Phys. Rev. A

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We use the R-matrix with time-dependence method to study detachment from F − in circularlypolarized laser fields of infrared wavelength. By decomposing the photoelectron momentum distribution into separate contributions from detached 2p1 and 2p−1 electrons, we demonstrate that the detachment yield is distributed asymmetrically with respect to these initial orbitals. We observe the well-known preference for strong-field detachment of electrons that are initially counter-rotating relative to the field, and calculate the variation in this preference as a function of photoelectron energy. The wavelengths used in this work provide natural grounds for comparison between our calculations and the predictions of analytical approaches tailored for the strong-field regime. In particular, we compare the ratio of counter-rotating electrons to corotating electrons as a function of photoelectron energy. We carry out this comparison at two wavelengths, and observe good qualitative agreement between the analytical predictions and our numerical results. arXiv:1911.00290v1 [physics.atom-ph] 1 Nov 2019

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“…The bracket symbol that appears in Eqs. (28) and (29) is the ceiling function, meaning the smallest integer containing the quantity within the bracket. Each circularly polarized photon possesses one quantum unit of angular momentum, and all of these angular momenta are aligned, meaning that the photoelectron should possess about 17 quantum units of angular momentum.…”

Section: B Circular Polarization In the Lgmentioning

confidence: 99%

Altered Maxwell equations in the length gauge

Reiss¹

2013

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

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The length gauge uses a scalar potential to describe a laser field, thus treating it as a longitudinal field rather than as a transverse field. This distinction is revealed in the fact that the Maxwell equations that relate to the length gauge are not the same as those for transverse fields. In particular, a source term is necessary in the length-gauge Maxwell equations, whereas the Coulomb-gauge description of plane waves possesses the basic property of transverse fields that they propagate with no source terms at all. This difference is shown to be importantly consequential in some previously unremarked circumstances; and it explains why the Göppert-Mayer gauge transformation does not provide the security that might be expected of full gauge equivalence.

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Experimental Study of Photodetachment in a Strong Laser Field of Circular Polarization

Cited by 60 publications

References 17 publications

Relativistic effects in nonrelativistic ionization

Relativistic effects in nonrelativistic ionization

Electron rotational asymmetry in strong-field photodetachment from F− by circularly polarized laser pulses

Altered Maxwell equations in the length gauge

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