Dissociative multiple photoionization of SiBr4 and GeBr4 in the VUV and X-ray regions: a comparative study of inner-shell processes involving Si(2p, 2s), Ge(3d, 3p, 3s), and Br(3d, 3p, 3s)

Boo, Bong Hyun; Saitô, Norio

doi:10.1016/s0368-2048(02)00183-4

Cited by 1 publication

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“…Such atomic giant resonance is not only well known for the 4d-elements, such as, I and Xe but also has been theoretically predicted for a 3d-atom, such as, Kr [48]. In Br compounds the information on collective effects are scarce, however, the giant shape resonance of 3d 10 to 3d 9 f has been identified experimentally [49].…”

Section: Ddcs Ratiosmentioning

confidence: 81%

Electron emission from bromouracil and uracil induced by protons and radiosensitization

et al. 2022

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Absolute double differential cross sections (DDCS) of electrons emitted from uracil and 5-bromouracil (BrU) in collisions with protons of energy 200 keV have been measured for various forward and backward emission angles over wide range of electron energies. The measured DDCS are compared with the continuum distorted wave-eikonal initial state (CDW-EIS) calculations. The optimized structure of the BrU was estimated along with the population analysis of all the occupied orbitals using a self-consistent field density. A comparison between the measured DDCS data for the two molecules show that the cross section of low energy electrons emitted from BrU is substantially larger than that for uracil. The BrU-to-uracil DDCS ratios obtained from the present measurements indicate an enhancement of the electron emission by a factor which is as large as 2.0 to 2.5. These electrons being the major agent for damaging the DNA/RNA of the malignant tissues, the present results are expected to provide an important input for the radiosensitization effect in hadron therapy. It is noteworthy to mention that the CDW-EIS calculations for Coulomb ionization cannot predict such enhancement. A large angular asymmetry is observed for uracil with a broad structure, which is absent in case of BrU.

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Section: Ddcs Ratiosmentioning

confidence: 81%