absorption band
absorption line
absorption spectrum

Balmer series
band spectrum
blue shift
Brackett series

continuous spectrum
coronal lines
cyanogen bands

D lines
diffraction grating
diffuse interstellar bands
dispersion
Doppler effect

échelle grating
electromagnetic spectrum
electron spin resonance
electron transition
emission line
equivalent width

Fabry-Pérot interferometer
fine structure
flash spectrum
forbidden line
Fraunhofer line
free-bound transition
free-free transition

H and K lines
H-alpha
hydrogen spectrum

inverse P Cygni profile

line blanketing
line broadening
line ratio
line spectrum
Lyman-alpha
Lyman series

multiplet

nebula filter

P Cygni profile
Paschen-Back effect
pressure broadening

Raman effect
Raman spectroscope
redshift

Saha equation
spectral line
spectral series
spectral type
spectroheliograph
spectrophotometer
spectroscope
spectrum
Stark effect
Swan bands

telluric lines
TiO bands
21-centimeter line

UV Raman and fluorescence spectroscopy

Zeeman effect