1110.3432 (Alexei M. Frolov)

On the absorption of radiation by the negatively charged hydrogen ion    [PDF]

Alexei M. Frolov

Absorption of infrared and visible radiation from stellar emission spectra by the negatively charged hydrogen ions H$^{-}$ is considered. We derive the explicit formulas which can be used to determine the total absorption coefficient (per unit volume) for the negatively charged hydrogen ions ${}^{1}$H$^{-}$ (protium) and ${}^{2}$H$^{-}$ (deuterium or D$^{-}$). The computed bound-free and free-free absorption coefficients $a_{\nu}$ and $k_{\nu}$ can be used to evaluate the actual absorption of infrared and visible radiation by the H$^{-}$ ion in photospheres of many cold stars with surface temperatures $T_s \le$ 8,250 $K$.

View original: http://arxiv.org/abs/1110.3432