Cationic Dependence of X-ray Induced Damage in Strontium and Barium Nitrate

Goldberger, David; Park, Changyong; Evlyukhin, Egor; Cifligu, Petrika; Pravica, Michael

doi:10.1021/acs.jpca.8b08224

Title: Cationic Dependence of X-ray Induced Damage in Strontium and Barium Nitrate

Journal Article · Fri Oct 19 00:00:00 EDT 2018 · Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory

DOI:https://doi.org/10.1021/acs.jpca.8b08224· OSTI ID:1488763

Goldberger, David ^[1]; Park, Changyong ^[2]; Evlyukhin, Egor ^[1]; Cifligu, Petrika ^[1];

^[1]

Univ. of Nevada, Las Vegas, NV (United States). Dept. of Physics
Carnegie Inst. of Washington, Argonne, IL (United States). Geophysical Lab., High Pressure Collaborative Access Team (HPCAT)

The response of solids to x-ray irradiation is not well understood, in part, because the interactions between x-rays and molecules in solids depend on the intra- and/or inter-molecular electronic properties of the material. Our previous work demonstrated that x-ray induced damage of certain ionic salts depends on the irradiating photon energy, especially when irradiated with photons of energy near the cation’s K-edge. To advance understanding of the cationic dependence of x-ray photochemistry, we present studies of x-ray induced damage of barium nitrate and strontium nitrate. Polycrystalline samples of barium and strontium nitrate were irradiated with high flux monochromatic synchrotron x-rays at selected energies near the K-edge of the respective cations. The damage processes were studied with powder x-ray diffraction, and irradiation products, NO₂ and O₂, were characterized via Raman spectroscopy. Our results demonstrate that irradiating barium and strontium nitrate with photons of energy greater than the K-edge of the cation promotes high rate of decomposition compared to that observed when irradiating with photons of energy below the K-edge. Additionally, differences in x-ray induced damage between the two compounds are examined and discussed, and evidence of the diffusion of irradiation products is presented.

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Research Organization:: Univ. of Nevada, Las Vegas, NV (United States); Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0002912; FC08-01NV14049; FG02-99ER45775; NA0001974; AC02-06CH11357

OSTI ID:: 1488763

Alternate ID(s):: OSTI ID: 1487029

Journal Information:: Journal of Physical Chemistry. A, Molecules, Spectroscopy, Kinetics, Environment, and General Theory, Vol. 122, Issue 44; ISSN 1089-5639