Accession Number : AD0670022

Title :   TOTAL RADIANCES AND EQUIVALENT WIDTHS OF ISOLATED SPECTRAL LINES WITH COMBINED DOPPLER AND COLLISION-BROADENED PROFILES,

Corporate Author : MICHIGAN UNIV ANN ARBOR INST OF SCIENCE AND TECHNOLOGY

Personal Author(s) : Yamada,H. Y.

Report Date : OCT 1967

Pagination or Media Count : 33

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)

Descriptors :   (*INFRARED SPECTROSCOPY, LINE SPECTRA), EMISSIVITY, DOPPLER EFFECT, ABSORPTION SPECTRA

Subject Categories : Infrared Detection and Detectors
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE