Measurement of the Energy Dependence of X-ray-Induced Decomposition of Potassium Chlorate.
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- 作者：Michael Pravica ; Ligang Bai ; Daniel Sneed ; Changyong Park
- 刊名：The Journal of Physical Chemistry A
- 出版年：2013
- 出版时间：March 21, 2013
- 年：2013
- 卷：117
- 期：11
- 页码：2302-2306
- 全文大小：262K
- 年卷期：v.117,no.11(March 21, 2013)
- ISSN：1520-5215
文摘
We report the first measurements of the X-ray induced decomposition of KClO3 as a function of energy in two experiments. KClO3 was pressurized to 3.5 GPa and irradiated with monochromatic synchrotron X-rays ranging in energy from 15 to 35 keV in 5 keV increments. A systematic increase in the decomposition rate as the energy was decreased was observed, which agrees with the 1/E3 trend for the photoelectric process, except at the lowest energy studied. A second experiment was performed to access lower energies (10 and 12 keV) using a beryllium gasket; suggesting an apparent resonance near 15 keV or 0.83 呛 maximizing the chemical decomposition rate. A third experiment was performed using KIO3 to ascertain the anionic dependence of the decomposition rate, which was observed to be far slower than in KClO3, suggesting that the O鈥揙 distance is the critical factor in chemical reactions. These results will be important for more efficiently initiating chemical decomposition in materials using selected X-ray wavelengths that maximize decomposition to aid useful hard X-ray-induced chemistry and contribute understanding of the mechanism of X-ray-induced decomposition of the chlorates.