TOTAL RADIANCES AND EQUIVALENT WIDTHS OF ISOLATED SPECTRAL LINES WITH COMBINED DOPPLER AND COLLISION-BROADENED PROFILES,
Abstract
Analytical expressions for total radiances (NV) and equivalent widths (WV) of isolated spectral lines with combined Doppler and collision-broadened profiles are presented for isothermal paths. It is shown that the 'curves of growth' for 0 < a < 0.5, where a/(ln2) to the 1/2 power is the ratio of the Lorentz to the Doppler line half-width, can be divided into three regions, depending on optical depth: purely Doppler, purely Lorentz, and a transition region between the two for which explicit expressions are given. For a=0, only Doppler broadening is effective and the curve of growth is purely Doppler, irrespective of optical depth. For a > or = 0.5, the curves of growth are shown to be equivalent to purely Lorentz, irrespective of optical depth. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1967
- Accession Number
- AD0670022
Entities
People
- H. Y. Yamada
Organizations
- University of Michigan