Calculation of electron-loss-to-continuum cusps: An algebraic approach

Burgdörfer, Joachim; Breinig, M.; Elston, S. B.; Sellin, I. A.

doi:10.1103/physreva.28.3277

Cited by 65 publications

(20 citation statements)

References 34 publications

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“…This indicates that the observed structure has the same origin, i.e., it originates from the singularity in the electron continuum wave function at zero energy in the presence of a Coulomb field, a fact that is well-known in the physics of ion-atom collisions [47][48][49] . Ionization of He by 1 GeV/u U 92+ ion impact has been described using the equivalent photon approximation 45,50,51 , where the electromagnetic field of the ion is interpreted by a broad-band virtual photon field.…”

Section: Discussionmentioning

confidence: 83%

<title>Single ionization of atoms in intense laser pulses: evolution from multiphoton to tunnel ionization</title>

et al. 2006

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We present results of high resolution fully differential measurements on single ionization of He, Ne, and Ar by 7 -25 fs linearly polarized 800 nm laser pulses at intensities of up to 2 . 1015 W/cm 2 . Using a 'Reaction-Microscope' we were able to trace signatures of multiphoton ionization deep into the tunnelling regime. Surprisingly, in the low-energy electron spectra we observed several features (absence of the ponderomotive shifts, splitting of the peaks, their degeneration for few-cycle laser pulses) typical for resonantly-enhanced ionization. Other remarkable features, as the sharp cusp-like momentum distributions in the direction perpendicular to the laser field or the observed minima at zero longitudinal momentum for He and Ne, can be reproduced by semiclassical models, where the electron motion in the combined laser and Coulomb field is treated classically after the tunnelling.

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Section: Discussionmentioning

confidence: 83%

<title>Single ionization of atoms in intense laser pulses: evolution from multiphoton to tunnel ionization</title>

et al. 2006

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“…The effective angular resolution of -0.3° was determined primarily by the exit aperture of the analyzer, and the angular distribution was centered within ±0.2°. Both experimental [17] and theoretical [18,19] work indicate that the peak of the DDCS ECC cusp exhibits a considerably larger droop toward lower energies with increasing detection angle than the ELC. Over the angular range shown in Fig.…”

Section: Fig 3 Experimental D 2 A/dedil Cusp Shape (Normalized) Formentioning

confidence: 96%

Intramolecular electron-loss contributions to cusp shapes and yields for ∼1 MeV/nucleon bare H and He on hydrocarbon gases

Bissinger

Mehta

1992

Phys. Rev. Lett.

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Zero-degree do/dE and d 2 o/dE dft cusp-shape and yield variations indicate substantial electron-lossto-continuum (ELC) contributions in the electron-capture-to-continuum (ECC) spectra obtained with bare H and He -1 MeV/nucleon projectiles on hydrocarbon molecules. An intramolecular geometrical outscattering model of secondary collisions has been developed to calculate the ELC fraction of the cusp /ELC, extract the separate ECC and ELC contributions from measured projectile velocity frame cusp contours, and predict a nominal Zp dependence for ELC yields in agreement with experiments in our velocity range.

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“…We will denote as P~"' the coefficients for excitation to the level n. When n becomes infinite these sums converge to the ionization threshold value (u~0) of the = u 'Po(u) g a (u)P (cos8) 6f V (6) or, regarding Eq. (4), 6f CT =u g B"ou"gaj(u)P. (cos8), n J with B~J V der/dE coefficients [15]. This is a characteristic of the Coulomb final-state interaction between the ion and the electron, and is also true for the capture process.…”

Section: The Angular Expansionmentioning

confidence: 98%

Convergence of the multipole expansion for the doubly differential ionization cross section

Cravero¹,

Garibotti²

1994

Phys. Rev. A

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We analyze the convergence of the Legendre polynomials expansion of the doubly differential cross section (DDCS) for soft electron emission (SEE) in ion-atom collisions. This expansion has been recently employed in the analysis of the angular shape of theoretical as well as experimental data on SEE. Numerical calculations using the continuum-distorted-wave-eikonal-initial-state (CDW-EIS) approximation show that for suScient low electron velocity, the DDCS for ionization is well described with a few terms of the expansion. Besides, we show analytically that the expansion reduces to the 6rst three terms in the zero-emission-velocity limit, within CDW or CDW-EIS approaches.PACS number(s): 34.50.Fa P, (v) by fitting experimental data for He ionization by impact of H+, He +, C + and 0 + projectiles, and they were compared with theoretical values. However, the low number of available angular data and the experimental uncertainties did not allow us to analyze the rate of

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Calculation of electron-loss-to-continuum cusps: An algebraic approach

Cited by 65 publications

References 34 publications

<title>Single ionization of atoms in intense laser pulses: evolution from multiphoton to tunnel ionization</title>

<title>Single ionization of atoms in intense laser pulses: evolution from multiphoton to tunnel ionization</title>

Intramolecular electron-loss contributions to cusp shapes and yields for ∼1 MeV/nucleon bare H and He on hydrocarbon gases

Convergence of the multipole expansion for the doubly differential ionization cross section

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