Single and double photoionisation of Ca atoms between 35 and 42 nm
Single and double photoionisation of Ca atoms between 35 and 42 nm
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35 至 42 nm 范围内 Ca 原子的单光电离和双光电离
DOI：
10.1088/0022-3700/18/2/010
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发表时间：
1985
期刊：
影响因子：
--
通讯作者：
M. Yoshino
中科院分区：
文献类型：
--
作者：
Yoshinori Sato;T. Hayaishi;Y. Itikawa;Y. Itoh;J. Murakami;T. Nagata;T. Sasaki;B. Sonntag;A. Yagishita;M. Yoshino
本文用单色同步辐射源和钙原子束耦合的飞行时间质谱仪研究了钙原子的光电离。相对光电离截面（单光电离的q+和双光电离的q ~ 2+，以及比值R= q ~ 2 +/q ~+）已在波长范围35-42 nm内测量，带宽为0.15 nm。与曼斯菲尔德和Newsom（1977）的光吸收数据比较表明，当质子能量高于最低的3 p电离极限时，吸收共振和Ca 2+产率之间的峰结构具有良好的对应关系。R随波长的变化表现出与一些3 p电离极限相关的阶跃行为。
Photoionisation of Ca atoms has been investigated by means of a time-of-flight mass spectrometer coupled with a source of monochromatised synchrotron radiation and an atomic Ca beam. Relative photoionisation cross sections (q+ for single photoionisation and q2+ for double photoionisation, as well as the ratio R=q2+/q+) have been measured in the wavelength range 35-42 nm with a 0.15 nm bandwidth. Comparison with the photoabsorption data of Mansfield and Newsom (1977) shows a good correspondence in the peak structure between the absorption resonance and the Ca2+ yield for proton energies above the lowest 3p ionisation limit. The variation of R with wavelength exhibits a step behaviour which correlates with some of the 3p ionisation limits.