Simultaneous measurements of absolute numbers of electrons and scintillation photons produced by 5.49 MeV alpha particles in rare gases
Simultaneous measurements of absolute numbers of electrons and scintillation photons produced by 5.49 MeV alpha particles in rare gases
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DOI：
10.1109/tns.2003.820615
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发表时间：
2003-12-01
影响因子：
1.8
通讯作者：
Shibamura, E
中科院分区：
文献类型：
--
作者：
Saito, K;Sasaki, S;Shibamura, E
在1.01×10⁵帕到1.01×10⁶帕的气压范围内，同时测量了氩气、氪气和氙气中由5.49兆电子伏α粒子产生的闪烁光子和电子的绝对数量。激发原子数与电子 - 离子对数之比是理解吸收辐射能的能量途径的一个重要量，在氩气、氪气和氙气中分别为0.52、0.55和0.60。这些比值是通过测量源于激发原子的闪烁光子数和电子数来确定的。在所有电子 - 离子对复合的情况下，定义为产生一个光子的平均能量的Ws值，在氩气、氪气和氙气中分别估计为17.5、15.4和13.0电子伏。从与离子复合后逃逸的电子数和闪烁光子数之间的关系，通过实验证实一个复合过程发射一个闪烁光子。这意味着由三体碰撞产生的激发分子在不发射真空紫外区域的闪烁光子的情况下不会去激发。
The absolute numbers of scintillation photons and electrons produced by 5.49 MeV alpha particles were measured simultaneously in argon, krypton and xenon in the gas pressure range from 1.01 x 10(5) Pa. to 1.01 x 10(6) Pa. The ratio of the number of excited atoms to the number of electron-ion pairs is an important quantity for understanding the energy pathway of the absorbed radiation energy and was found to be 0.52, 0.55, and 0.60 in argon, krypton and xenon, respectively. The ratios were determined by measuring the number of scintillation photons originating from the excited atoms and the number of electrons. The value of W-s, which is defined as the average energy to produce one photon, in the case that all of the electron-ion pairs recombine was estimated to be 17.5, 15.4, and 13.0 eV in argon, krypton and xenon, respectively. From the relation between the numbers of electrons escaping from the recombination with ions and the numbers of scintillation photons, it is confirmed experimentally that one scintillation photon is emitted from one recombination process. This means that an excited molecule caused by three-body collisions is not de-excited without emitting a scintillation photon in the vacuum ultraviolet region.