Compton profiles of heavy atoms by inelastic proton-electron scattering

Spies, R.; Bell, F.

doi:10.1007/bf01318294

Cited by 5 publications

(7 citation statements)

References 46 publications

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“…production of highly intense circularly polarized beams, which can be used for efficient measurements of magnetic Compton scattering. Speaking about the experimental technique, we should also like to point out once again the first attempts to measure the truly 3-dimensional electron momentum distribution by means of the (y, ey) coincidence technique [19,20] and the use of highly energetic protons [21] as particles ejecting electrons. Both techniques are expected to deliver many interesting results, particularly concerning thin films.…”

Section: Discussionmentioning

confidence: 99%

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Recent Advances in Compton Scattering

Dobrzyński

1993

Zeitschrift Für Naturforschung A

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Section: Discussionmentioning

confidence: 99%

“…This fact became a basis of the experiment performed by Spies and Bell [21] with the use of 21 MeV protons impinging on thin (less than 0.1 jim thick) foils of silver and gold. In an experiment like that, the spectral line shape of the ejected electrons (i.e.…”

Section: Experimental Techniquementioning

confidence: 99%

Recent Advances in Compton Scattering

Dobrzyński

1993

Zeitschrift Für Naturforschung A

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“…The loss of accuracy is the most pronounced for inner shells of the heavy atoms. Spies and Bell suggested that the factorizable expression has limitations based on their study on the use of DDCS measured from proton scattering experiments to obtain a CP [4].…”

Section: Introductionmentioning

confidence: 99%

Correction of a relativistic impulse approximation expression used to obtain Compton profiles from photon scattering doubly differential cross sections

LaJohn

2022

J. Phys. Commun.

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A Compton profile (CP) can provide useful information about the electron populations and distributions in atoms, molecules, and ions to assess many physical properties of matter. However, a CP cannot be measured directly, but must be obtained from scattering data. The CPs discussed in this study are derived from photon-atom doubly differential cross sections (DDCS) via the following expression which is derived from an impulse approximation (IA) theory given by DDCS = KJ, where K represents a kinematic factor and J represents the CP. A relativistic version of this expression (i.e., RKJ)—an approximation of the full relativistic IA expression—is used for relativistic regimes; however, it does not yield accurate results for the inner and middle shells of moderate to heavy atoms. In this study, expressions from nonrelativitic (NR) hydrogen-like wavefunctions with a relativistic QED kinematic factor Krel and relativistic electron energy were derived to correct the RKJ expression for the K, L, M, and N atomic subshells. This derivation made it possible for relativistic contributions and screening effects to largely cancel, for any regime of energy angle and Z. Thus, the RKJ error which can be greater than 30% is reduced to within few percent over 99% of the electron momentum distribution range of any subshell CP when compared to published tabulated theoretical values. Two simple versions of the relativistic QED kinematic component of the corrected RKJ expressions were obtained and tested: one valid at high photon energies, and the other at small scattering angles. RKJ corrections were applied to the extraction of CP from the full spectrum K-N shell DDCS, which resulted in much improved accuracy for the K-shell. Good agreement was observed with tabulated beyond K-shell CPs around the tail regions, but systematic differences were found to occur at the maxima.

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“…at J(0). Spies and Bell [12] have reported ion electron Compton profile of Au using proton-electron scattering.…”

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confidence: 99%

Compton profile study of gold: Theory and experiment

Ahuja¹,

Sharma

Bross³

2007

Physica Status Solidi (b)

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We present momentum densities and Compton profiles for gold calculated in the local-density approximation (LDA) by use of the modified augmented plane wave (MAPW) self-consistent scheme. Our theoretical calculations have been compared with our experimental Compton profile, measured at an intermediate resolution (0.40 a.u.) using 661.65 keV gamma-rays. We have also compared our measurements with the APW calculations of Papanicolaou et al. It is seen that our LDA-MAPW calculations with e --e -correlation correction are in better agreement with our experimental data.

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Compton profiles of heavy atoms by inelastic proton-electron scattering

Cited by 5 publications

References 46 publications

Recent Advances in Compton Scattering

Recent Advances in Compton Scattering

Correction of a relativistic impulse approximation expression used to obtain Compton profiles from photon scattering doubly differential cross sections

Compton profile study of gold: Theory and experiment

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