Theoretical Study of Sodium and Potassium Resonance Lines Pressure Broadened by Helium Atoms

Abstract

We perform fully quantum mechanical calculations in the binary approximation of the emission and absorption profiles of the sodium $3s$-$3p$ and potassium $4s$-$4p$ resonance lines under the influence of a helium perturbing gas. We use carefully constructed potential energy surfaces and transition dipole moments to compute the emission and absorption coefficients at temperatures from 158 to 3000 K. Contributions from quasi-bound states are included. The resulting red and blue wing profiles agree well with previous theoretical calculations and with experimental measurements.

arXiv comment16 figures

References in corpus (7)

• The Theory of Brown Dwarfs and Extrasolar Giant Planets
• Theoretical Transmission Spectra During Extrasolar Giant Planet Transits
• Transmission Spectra as Diagnostics of Extrasolar Giant Planet Atmospheres
• Calculations of the Far-Wing Line Profiles of Sodium and Potassium in the Atmospheres of Substellar-Mass Objects
• Four nearby L dwarfs
• A theoretical look at the direct detection of giant planets outside the Solar System
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• Temperature and density dependence of line profiles of sodium perturbed by helium