J/A+AS/103/57 J/A+AS/103/57 Spectral coefficients of emission and absorption A A Mihajlov M S Dimitrijevic L J M Ignjatovic Z Djuric Astron. Astrophys. Suppl. Ser. 103 57 1994 1994A&AS..103...57M atomic data atomic processes radiation mechanisms: thermal Sun: atmosphere Spectral coefficients of spontaneous emission and absorption (for 365nm <= {lambda} <= 820nm range) due to ion-atom radiation processes H^+^ + H(1s) <--> H^+^_2_(1{SIGMA}_g_) and H^+^ + H(1s) <--> H(1s) +H^+^ are presented. Calculations have been performed within semiclassical approach for standard solar photosphere and chromosphere models. The presented numerical results enable the inclusion of considered ion-atom radiative processes in the optical depth calculation for the layers mentioned. These results might be of interest as well for other astrophysical plasmas with dominant hydrogen component and temperatures around 6000 K.

h Height km T Plasma temperature K Ne Electron density cm-3 Nth Total hydrogen density cm-3 eta_e1 (N(H+)/NE)*(N(H)/Ni) ratio number=1 N(H+) is the proton density, Ni is the total density of positive atomic ions and N(H) is the atom (H(1s)) density --- eta_ea N(H+)/Ne ratio number=1 N(H+) is the proton density, Ni is the total density of positive atomic ions and N(H) is the atom (H(1s)) density --- h Height km e365 Emissivity at 365 nm W/cm3/nm e400 Emissivity at 400 nm W/cm3/nm e500 Emissivity at 500 nm W/cm3/nm e600 Emissivity at 600 nm W/cm3/nm e700 Emissivity at 700 nm W/cm3/nm e820 Emissivity at 820 nm W/cm3/nm h Height km K365 Spectral absorption coefficient at 365 nm cm-1 K400 Spectral absorption coefficient at 400 nm cm-1 K500 Spectral absorption coefficient at 500 nm cm-1 K600 Spectral absorption coefficient at 600 nm cm-1 K700 Spectral absorption coefficient at 700 nm cm-1 K820 Spectral absorption coefficient at 820 nm cm-1 Francois Ochsenbein CDS 1993Nov17 J_A+AS_103_57.xml