X-ray-photon scattering by an excited atom

Hopersky, A. N.; Nadolinsky, A. M.; Novikov, Sergey A.

doi:10.1103/physreva.88.032704

Cited by 4 publications

(8 citation statements)

References 31 publications

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“…According to, e.g., [7] (hco| = 10 keV, r = 50 as) and [8] (hco\ = 1.6 keV, r = 2.5 as) the above double inequality may be realized experimentally. As a result, one can expect the experimental discovery of the quantum effects predicted in [3] and in this work when a photon is scattered by a previously excited and ionized many-electron system.…”

Section: Introductionmentioning

confidence: 85%

“…o)2 is the energy of the scattered photon. a description of two quantum effects of scattering of the o){ photon by the ionized atom, which were not investigated in [3]. Fig.…”

Section: Anomalous Inelastic Scatteringmentioning

confidence: 99%

“…[lP|] states of the continuous spectrum. The inclusion of the latter, as will be shown, leads to the discovery of new quantum effects in the processes of scattering of a photon by an excited and ionized atom, which was not studied in [3].…”

Section: Introductionmentioning

confidence: 95%

“…In this work we relax the mentioned constraints of [3] and construct a general nonrelativistic quantum theory of triple differential scattering cross section [d3cr/d(hw0) dihap) d£l2] of a photon by an excited and ionized atom with attosecond duration of the contact interaction between the photons and the atom for arbitrary energy of the hco0 photon. As an example, we consider the atom of neon (Ne: Z = 10, [0] = \s 22s22pb['So]).…”

Section: Introductionmentioning

confidence: 99%

“…We recently performed a theoretical investigation of the double-differential cross section [d2o/d{ha>2 )dSl2 \ ha>2 is energy and LL is the solid angle of flight of the scattered photon] of this process [3] for the beryllium atom (Be: nuclear charge is Z -4, configuration and ground-state term are [0] = ls 22s2['So]). We determined that with the duration of interaction between the photons and the excited atom much smaller than the lifetime of the Is vacancy, the quantum effect of anomalous (a>2 > a>i) inelastic scattering of the photon by the previously excited many-electron system is realized.…”

Section: Introductionmentioning

confidence: 99%

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X-ray-photon scattering by an excited and ionized atom

et al. 2015

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The scattering process of an x-ray photon by an excited and ionized many-electron atom with attosecond photon-electron contact interaction is theoretically investigated. The results of the authors' recent work [Hopersky et a l, Phys. Rev. A 88, 032704 (2013)] are generalized for the cases of (a) arbitrary energy of the photon that prepares the scattering state and (b) the scattering of the photon by the continuous spectrum electron of the ionization state of the atom. The atom of Ne is considered as the object of the study. Along with the effects of normal Compton and elastic scattering, the existence of anomalous inelastic scattering is predicted. It may be assumed that this effect will become a basis for an experimental method of increasing the energy of the photons generated, for example, by a free-electron x-ray laser. It is determined that during the elastic scattering of a photon by an electron of the continuous spectrum, along with the known contribution from the f Bessel function over the I = 0 harmonic (Thomson scattering), there is also a contribution from Bessel functions with harmonics / e [1; oo). The experimental discovery and application of the anomalous Compton photon scattering effect directly by the atomic electron of the continuous spectrum have their own practical interest.

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Section: Introductionmentioning

confidence: 85%

“…o)2 is the energy of the scattered photon. a description of two quantum effects of scattering of the o){ photon by the ionized atom, which were not investigated in [3]. Fig.…”

Section: Anomalous Inelastic Scatteringmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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X-ray-photon scattering by an excited and ionized atom

et al. 2015

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Anomalous nonlinear X-ray Compton scattering

et al. 2015

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X-ray scattering is typically used as a weak linear atomic-scale probe of matter. At high intensities, such as produced at free-electron lasers, nonlinearities can become important, and the probe may no longer be considered weak. Here we report the observation of one of the most fundamental nonlinear X-ray-matter interactions: the concerted nonlinear Compton scattering of two identical hard X-ray photons producing a single higher-energy photon. The X-ray intensity reached 4 × 10 20 W cm −2 , corresponding to an electric field well above the atomic unit of strength and within almost four orders of magnitude of the quantum-electrodynamic critical field. We measure a signal from solid beryllium that scales quadratically in intensity, consistent with simultaneous non-resonant two-photon scattering from nearly-free electrons. The high-energy photons show an anomalously large redshift that is incompatible with a free-electron approximation for the ground-state electron distribution, suggesting an enhanced nonlinearity for scattering at large momentum transfer.

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X-ray-photon Compton scattering by a linear molecule

Hopersky¹,

Nadolinsky²,

Novikov³

et al. 2015

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

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We formulate a nonrelativistic quantum theory for the nonresonant inelastic scattering process of an x-ray photon by a free linear molecule outside of the impulse approximation framework. We find a strong orientation effect dependent on changes in the schemes of the proposed experiments. Calculations of the absolute values and forms for the double differential scattering cross sections are carried out for the HF molecule and have a predictive character. The presented theory is of a general nature, and its applicability to a particular linear molecule is constrained only by the demand of correctness of nonrelativistic methods for constructing molecular scattering orbitals.

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X-ray-photon scattering by an excited atom

Cited by 4 publications

References 31 publications

X-ray-photon scattering by an excited and ionized atom

X-ray-photon scattering by an excited and ionized atom

Anomalous nonlinear X-ray Compton scattering

X-ray-photon Compton scattering by a linear molecule

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