Abstract
Absolute photoionisation cross sections for Ca+ were measured by merging resolved beams of VUV synchrotron radiation (282<or= lambda <or=498AA) and unexcited Ca+ ions. The resolution ( triangle lambda ) ranged from 0.2 to 1.0AA and the accuracy of the measurements was assessed to be +or-15%. Some 30 peaks were resolved in the photoionisation spectrum, the largest of which occurred at 373.6 AA (33.19 eV) and corresponded to a cross section of 2.2*10-15 cm2 with an oscillator strength of 2.3. This energy is close to values of 33.20 and 33.63 eV calculated by other authors for the autoionising state (3p53d1P)4s2P. Comparisons are also made with spectroscopic measurements of neutral calcium taken by Mansfield and Newsom (1977), absorption spectra of Ca+ obtained by Lucatorto (1986) and the ejected-electron spectra of Pejcev et al (1978).
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