Effect of correlations between absorbed and emitted frequencies on the transport of resonance radiation

An equation for the transport of resonance radiation at low and intermediate pressures is derived and shown to be in reasonable agreement with an experiment conducted in parallel with the theoretical development. Both dealt with the transport of 1048- resonance photons in argon in the pressure range 0.002-10 Torr. At pressures greater than 1 Torr where collisions are frequent, the present transport equation is equivalent to that of Holstein and Biberman. In the pressure region from 0.002 to 0.5 Torr there is substantial disagreement (as much as a factor of 3) between the present work and theory that assumes complete redistribution of frequency, i.e., takes the emission profile to be equal to the absorption profile.