Connection between the bremsstrahlung tip and direct radiative recombination: Angular distributions and polarization correlations

Feng, I.J.; Goldberg, Ira B.; Kim, Young Soon; Pratt, R. H.

doi:10.1103/physreva.28.609

Cited by 16 publications

(10 citation statements)

References 12 publications

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“…Radiative recombination itself is related to its time-reversed processes, namely, photoionization and electron-positron pair production, by the principle of detailed balance [5,[11][12][13]. By comparing bremsstrahlung and radiative recombination it was shown theoretically that at the threshold dividing the two cases, i.e., the case of a finally free electron with negligibly low kinetic energy in the continuum E f 0 and the case E f 0 resulting in a finally bound electron captured into a high-lying Rydberg state n → ∞, both processes show comparable features in the differential cross sections and thus show a smooth transition from one process to the other [5,9,[14][15][16].…”

Section: Introductionmentioning

confidence: 89%

Radiative-electron-capture-to-continuum cusp inU88++N2collisions and the high-energy endpoint of electron-nucleus bremsstrahlung

Hillenbrand¹,

Hagmann²,

Atanasov³

et al. 2014

Phys. Rev. A

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The radiative electron capture of a target electron into the projectile continuum has been studied for the collision system U 88+ + N 2 → U 88+ + [N + 2 ] * + e − + γ at 90 MeV/u. Using a magnetic electron spectrometer, the energy distribution of cusp electrons emitted under an angle of 0 • with respect to the projectile beam and with a velocity close to the projectile velocity has been measured in coincidence with the emitted photons under various observation angles. The experimental results provide a stringent test for the corresponding process in inverse kinematics, namely, the theory of electron-nucleus bremsstrahlung at the high-energy endpoint. For comparison this process is calculated using fully relativistic Dirac wave functions and using semirelativistic Sommerfeld-Maue wave functions.

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Section: Introductionmentioning

confidence: 89%

Radiative-electron-capture-to-continuum cusp inU88++N2collisions and the high-energy endpoint of electron-nucleus bremsstrahlung

Hillenbrand¹,

Hagmann²,

Atanasov³

et al. 2014

Phys. Rev. A

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“…The SM calculations are done for the differential cross sections [24,31] and P 1 [9] up to 15 MeV. The partial-wave results also concern the differential cross sections [8,33,34,31] and P 1 [8,34] at energies mostly below 2 MeV. In [35,36,34] another noticable advantage of the SWL was explored, the smooth transition between bremsstrahlung at threshold and radiative recombination (RR) of a free electron into infinitely high-lying Rydberg states of the target.…”

Section: Introductionmentioning

confidence: 99%

Electron–heavy-nucleus bremsstrahlung at highly relativistic impact energies

Jakubaßa-Amundsen¹

2010

Phys. Rev. A

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Bremsstrahlung including the polarization correlations is revisited by presenting a new model which is applied to the short-wavelength limit. The fast incoming electron is described by a Sommerfeld-Maue function whereas for the outgoing electron an exact Dirac function is used. The cross section for electrons radiatively scattered from gold is calculated in the impact energy range 0.2-10 MeV and is compared to results from the Elwert-Haug theory and to available experimental data and relativistic partial-wave calculations. As an ultrarelativistic benchmark, the polarization correlations for 10 MeV electrons and 3-10 MeV photons are also given.

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“…Strong effects of the spin-orbital interaction were observed via left-right asymmetry of bremsstrahlung from transversally spinoriented electrons [4]. This high energy tip region might also be considered as the Rydberg series limit of radiative recombination (RR) [5,6] and therefore it also describes the spin dynamics of the fundamental process of photoionization in time reversal [7]. Relativistic theories predict that more differential studies of linear polarization of photons emitted by polarized electrons, with a particular emphasis on the angle of polarization, should reveal significantly finer details of the spin dynamics of electrons in strong fields [3,8].…”

mentioning

confidence: 99%

“…To evaluate c for this particular energy we have extrapolated the results of the RR polarization calculations towards the continuum threshold. Such a computational approach has been justified for the tip region in a number of works (see, for example, [6] and references therein). In the present contribution, the polarization of the RR photons emitted due to the recombination of longitudinally polarized electrons into bound high-n states has been calculated within the fully relativistic theory.…”

mentioning

confidence: 99%

Measurement of the Correlation between Electron Spin and Photon Linear Polarization in Atomic-Field Bremsstrahlung

et al. 2011

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Atomic-field bremsstrahlung has been studied with a longitudinally polarized electron beam. The correlation between the initial orientation of the electron spin and the angle of photon polarization has been measured at the photon high energy tip region. In the time reversal this corresponds to a so-far unobserved phenomenon of production of longitudinally polarized electrons by photoionization of unpolarized atoms with linearly polarized photons. The results confirm the fully relativistic calculations for radiative recombination and suggest a new method for electron beam polarimetry.

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Connection between the bremsstrahlung tip and direct radiative recombination: Angular distributions and polarization correlations

Cited by 16 publications

References 12 publications

Radiative-electron-capture-to-continuum cusp inU88++N2collisions and the high-energy endpoint of electron-nucleus bremsstrahlung

Radiative-electron-capture-to-continuum cusp inU88++N2collisions and the high-energy endpoint of electron-nucleus bremsstrahlung

Electron–heavy-nucleus bremsstrahlung at highly relativistic impact energies

Measurement of the Correlation between Electron Spin and Photon Linear Polarization in Atomic-Field Bremsstrahlung

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