DISCUSSION ON THE SELF-ABSORPTION OF SODIUM 330.3 NM RESONANCE LINE FOR THE SPHERICAL GEOMETRY PLASMA

In this letter, self-absorption is discussed using the concept of escape factor. The calculation method of the escape factor for spherical geometry plasma is discussed. For the spherical geometry, the escape factors Lambda(r) at any position r in a spherical geometry plasma (with the radius R) for Lorentzian and Holtsmarkian profiles are calculated, and a general expression is obtained. As an example, for the sodium 330.3 nm resonance line, the total radiance and the real radiance are calculated, and the self-absorption for the resonance line is discussed. This discussion will be useful for the study of the relationship of escape factor and the self-absorption of spectral lines for any geometries.