RADIATION LAWS UNDER NON-EQUILIBRIUM CONDITIONS
Abstract
The familiar radiation laws are reviewed, showing that the phenomenological coefficients of emission, absorption and conductivity are merely variants of the same basic quantity and can be readily transformed into each other. It follows that for a specific emission or absorption mechanism the calculation of either one of the coefficients is sufficient. The atomistic coefficients of spontaneous emission, absorptionAND INDUCED EMISSION AND THEIR MUTUAL RELATIONS ARE THEN DERIVED FROM Einstein's quantum probabilities for the case of radiative transitions of free particles. The concepts of thermodynamic equilibrium, steady state and detailed balancing are recalled. The energy transfer equation and its solution are discussed. In high temperature plasmas the atomistic radiation mechanisms of bremsstrahlung and cyclotron radiation are the most prominent ones. Cross sections are given for both processes, including quantum effects. Finally, emission and absorption coefficients are derived for arbitrary non-equilibrium plasmas. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1962
- Accession Number
- AD0278153
Entities
People
- Ludwig Oster
Organizations
- Yale University