Accession Number : AD0661986

Title :   AN EXPERIMENTAL DETERMINATION OF THE OSCILLATOR STRENGTHS FOR SOME TRANSITIONS IN THE LYMAN BANDS OF MOLECULAR HYDROGEN,

Corporate Author : ADELAIDE UNIV (AUSTRALIA) DEPT OF PHYSICS

Personal Author(s) : Haddad,G. N. ; Lokan,K. H. ; Farmer,A. J. D. ; Carver,J. H.

Report Date : 1967

Pagination or Media Count : 21

Abstract : The ultraviolet absorption cross-section for molecular hydrogen at room temperature was measured absolutely at a resolution of 0.3A, between 1060 and 1130A. This range of wavelengths covers the (0-0) through (3-0) vibrational bands of the B(1)Sigma(+)u - X(1)Sigma(+)g Lyman system. The nature of the curve of growth of an individual line was investigated in detail, and shown to agree closely with the expected behavior of a Doppler broadened Lorentz line for hydrogen at room temperature. A curve of growth analysis has been used to determine absolute line strengths for all observed transitions within each band. For each band the distribution of line strengths is in accordance with the expected weighted Boltzmann distribution of initial states at room temperature, with most of the observed absorption concentrated in the Ro, R1 and P1 transitions. Oscillator strengths for these bands were derived from the integrated band intensities, and confirm, within the limits of the experimental errors, the theoretical Franck-Condon factors. (Author)

Descriptors :   (*HYDROGEN, *ELECTRON TRANSITIONS), (*ULTRAVIOLET SPECTROSCOPY, HYDROGEN), ABSORPTION SPECTRA, BAND SPECTRA, DOPPLER EFFECT, STATISTICAL DISTRIBUTIONS, INTENSITY, AUSTRALIA

Subject Categories : Astrophysics
      Atmospheric Physics
      Atomic and Molecular Physics and Spectroscopy
      Plasma Physics and Magnetohydrodynamics

Distribution Statement : APPROVED FOR PUBLIC RELEASE