Accession Number:

AD0626164

Title:

THE ABSORPTION SPECTRUM OF CALCIUM VAPOR: 1660 - 2028 A,

Descriptive Note:

Corporate Author:

HARVARD COLL OBSERVATORY CAMBRIDGE MASS

Personal Author(s):

• Newsom,G. H.

Report Date:

1965-12-01

Pagination or Media Count:

26.0

Abstract:

The vacuum ultraviolet absorption spectrum of calcium vapor was observed in an attempt to discover transitions to new energy levels. Seven new levels were found between 51000 and 59000cm, three of which are ascribed to the 3d5p, 3d6p, and 5s4p configurations, with the remaining four lines resulting from transitions to 3d4f and 3d5f configurations. The 3d5p 3P1o level reported by Ditchburn and Hudson at 52225cm is now found at 51909cm. A graph of relative cross-section for photoionization from the ground state of calcium is shown between 1660 A and the principal series limit. A shock tube was used to observe several transitions to autoionizing levels from excited states. Author

Descriptors:

• CALCIUM
• ATOMIC PROPERTIES
• ELECTRON TRANSITIONS
• SHOCK TUBES

Subject Categories:

• Astrophysics
• Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE