期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 122, 期 44, 页码 8722-8728出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpca.8b08224
关键词
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资金
- Department of Energy National Nuclear Security Administration (DOE-NNSA) [DE-NA0002912]
- DOE [DE-FC08-01NV14049]
- University of Nevada, Las Vegas
- DOE-BES/DMSE [DE-FG02-99ER45775]
- DOE-NNSA [DE-NA0001974]
- NSF
- DOE Office of Science [DE-AC02-06CH11357]
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 intermolecular 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 Xray 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 O-2, 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 a higher 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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