Research Paper on Absolute Double Dierential Bremsstrahlung Cross Sections from Incident 4.0 keV Electrons on Free Ar Atoms

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Title: Absolute Double Dierential Bremsstrahlung Cross Sections from Incident 4.0 keV Electrons on Free Ar Atoms

Abstract: The measurements of the absolute double dierential cross sections (DDCSs) of bremsstrahlung caused by 4.0 keV electrons incident on free Ar atoms in the angular detection range of 45–120 are reported along with new findings. By changing the experimental setup previously used, a significant reduction of the thick target bremsstrahlung (TTB) of the chamber wall and of the photon transmission windows has been accomplished. The results of our model calculations for the ratio of TTB background to the normal bremsstrahlung (NB) spectrum carried out for the employed geometry of the experimental set-up support a large reduction of TTB in the present experiments. According to the Kissel-Quarles-Pratt (KQP) theory for ordinary bremsstrahlung and the stripping approximation’s predictions for total bremsstrahlung, including polarization bremsstrahlung (PBS), the results of photon energy distribution measured at different angles and those of angular distributions of photons of a given energy are compared (SA). On the one hand, it demonstrates a significant discrepancy (about a factor of 2) in DDCSs of bremsstrahlung photons obtained by experiment and by KQP theory for photon energy distributions at all detection angles measured, which, on the other hand, provides evidence for an appreciable contribution of polarization bremsstrahlung at the considered impact energy of electrons. Additionally, current results on the anisotropic distributions of photons with different energies and their angular dependence show that both the KQP and SA theories and these results are reasonably compatible. The satisfactory agreement between experiment and theory for angular distributions is a sign that the background created by TTB photons has been significantly reduced.

Keywords: angular distributions; ordinary bremsstrahlung; polarization bremsstrahlung; stripping approximation; thick target bremsstrahlung

Paper Quality: SCOPUS / Web of Science Level Research Paper

Subject: Physics

Subject Category: Atomic and Molecular Physics, and Optics

Writer Experience: 20+ Years

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