Revised absolute absorption cross sections of CaI at 1886.5 and 1765.1 AA
T J Mcilrath; R J Sandeman; T J Mcilrath; Harvard Coll. Obs., Cambridge, MA, USA; R J Sandeman; Harvard Coll. Obs., Cambridge, MA, USA
Журнал:
Journal of Physics B: Atomic and Molecular Physics
Дата:
1972-10-01
Аннотация:
The photo-ionization cross sections of CaI are measured photo-electrically at 1886.5 and 1765.1 AA; hooks of the 4226.78 AA resonance line are used to establish number densities. The resulting values for the absorption cross sections of 52 and 71*10<sup>-18</sup> cm<sup>2</sup> respectively are larger by a factor of 2.2 than previously published values based on vapour pressures.
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