Abstract:
The classical theory of collisional broadening and shift coefficients (β, d) of an isolated spectral line was used to obtain simple analytical formulae for calculating both β and d. These formulae were obtained on the assumption that the short range interaction was effective only in the broadening, while the long range was effective in the shift of the spectral line. These coefficients, β and d depended on the limiting phase shifts responsible for broadening hob and shift hod. It was found that the values of hob and hod were not equal to each other, as was proposed by Weisskopf hob = shift hod = 1, but were instead hob, = ± p / 5 and hod = ± p /2. The correct signs of these phases were obtained and defined. When these phases were applied with their correct signs in the approximate formulae, the broadening βc and shift dc coefficients for some interactions of TI, Hg, Cd, Zn, Ar and Nc with inert gases and self-interactions were in agreement with the corresponding values obtained numerically by other authors. The limit at which the shift changed its sign was also obtained. New impact parameters which were not known up to now have been discussed and obtained.
Page(s):
75-80
DOI:
DOI not available
Published:
Journal: Pakistan Journal of Scientific and Industrial Research, Volume: 48, Issue: 2, Year: 2005