Radiative Transitions

• semiclassical approximation
• transition probabilities
• dipole approximation
• selection rules

Absorption Lines and Curve of Growth

• observed absorption line spectra
  • the Sun
  • compare mystery stars here, here, here, and here (spoiler)
  • interstellar medium lines of potassium and lithium towards zeta Ophiuchi (Kawanomoto+ 2009), and in the SMC (Howk+ 2012)
• online catalog of transitions
• contributions to linewidths
• profile functions
• curve of growth
• hydrogen lines and the Lyman limit