Accession Number : AD0282887

Title :   FORMULAS FOR ESTIMATING WIDTHS OF SPECTRAL LINES EMITTED FROM PLASMAS AND THEIR LIMITS OF VALIDITY

Corporate Author : YALE UNIV NEW HAVEN CONN

Personal Author(s) : MARGENAU,HENRY

Report Date : 1956

Pagination or Media Count : 1

Abstract : General directives are given for estimating the width of spectral lines broadened by Stark effects. The approach involves defining physical conditions under which impact and statistical regions are valid, and in each case the regime of the Doppler effect is held in view. Three different regions in the n-T plane are distinguished, and plotted, n being the number density of ions (electrons) and T the absolute temperature. In region I both electrons and ions can be treated by impact theory. In II, ions are subject to statistical and electrons to impact description, whereas in III both behave statistically. Circled numbers in the diagrams refer to equations in the text which are appropriate for the calculation of half-widths in each region. (Author)

Descriptors :   *ATOMIC SPECTROSCOPY, *MAGNETIC FIELDS, *PLASMAS(PHYSICS), HELIUM, HYDROGEN

Distribution Statement : APPROVED FOR PUBLIC RELEASE