EPR studies of 5-bromouracil crystal after irradiation with X rays in the bromine K-edge region

Yokoya, Akinari; Takakura, Kaoru*; Watanabe, Ritsuko; Akamatsu, Ken*; Ito, Takashi*

Radiation Research, 162(4), p.469 - 473, 2004/10

https://doi.org/10.1667/RR3230

X-ray absorption spectra from single crystals of 5-Bromouracil were measured with the transmission mode in the energy range from 13.41 to 13.50 keV using the linearly polarized synchrotron radiation (SR). A characteristic resonance structure, consisting of four peaks, was recognized in the spectra in the Br K-edge region. The intensities of these peaks were strongly dependent on the crystal rotation about the normal of the crystal b-c plane, which was set perpendicular to the X-ray beam direction. (SR X-rays are polarized in the horizontal plane.) Molecular orbital calculations indicate that these resonance peaks are associated with the transitions from the 1s electron of Br to the Br-C molecular antibonding orbitals and to a shape resonance. The observed anisotropy of each photoabsorption peak might originate from the angular dependences of these molecular orbitals.

DELIGHT-6 : One Dimensional Lattice Burnup Code for High Temperature Gas-Cooled Reactors

*; ; ;

JAERI-M 83-176, 121 Pages, 1983/11

JAERI-M-83-176.pdf:2.78MB

no abstracts in English

Absorption spectrum of plutonium(VI) in alkaline potassium periodate solution

;

Journal of Nuclear Science and Technology, 19(4), p.334 - 335, 1982/00

https://doi.org/10.3327/jnst.19.334

no abstracts in English

Recoil-free resonant absorption of 35.3-keV gamma rays of Te and hyperfine structure of absorption spectrum

Journal of the Physical Society of Japan, 18(7), p.925 - 935, 1963/00

https://doi.org/10.1143/JPSJ.18.925

no abstracts in English