Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1960
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1960rspsa.256...53d&link_type=abstract
Proceedings of the Royal Society of London. Series A, Mathematical and Physical Sciences, Volume 256, Issue 1284, pp. 53-61
Astronomy and Astrophysics
Astrophysics
36
Scientific paper
Continuous absorption and line absorption of radiation in calcium vapour has been measured from the 4s4s^1S_0 --> 4snp^1P_1 series limit at 2028 to 1080 A. Two perturbed series of auto-ionization lines (4s4s^1S_0 --> 3dnp^1P_1 and --> 3dnp^3P_1) are recorded and analyzed. A second series limit is observed at 1589 A. This is probably two unresolved limits corresponding to the two series of auto-ionization lines. No absorption lines are observed on the short wavelength side of 1589 A. The f-values of the lines vary from 2.4 x 10-2 to 6 x 10-5 and the half-lives (calculated from measurements of the half-widths of the lines) vary from 30 to 260 x 10-15 s. The f-value for the 4s4s^1S_0 --> 4snp^1P_1 continuum is estimated to be 0.012 (including an allowance for a portion below 1589 A) and the f-value for the continua from wavelength 1589 to 1080 A corresponding to the two series of auto-ionization lines is estimated to be 0.003. The measured value of the absorption near 2028 A is about one-fiftieth of the theoretical value which has been used in astrophysical calculations.
Ditchburn R. W.
Hudson Robert D.
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