Year: 1985
Type: article
Abstract: 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 q 2+ for double photoionisation, as well as the ratio R=q 2+ /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 Ca 2+ 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.
Authors: Y Sato, T Hayaishi, Y Itikawa, Y Itoh, J Murakami, T Nagata, T Sasaki, B Sonntag, A Yagishita, M Yoshino
Institution: High Energy Accelerator Research Organization
Language: English
Topic: Atomic and Molecular Physics
Subfield: Atomic and Molecular Physics, and Optics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2021970698