Saturated absorption spectroscopy, also known as Doppler-free spectroscopy, can be used to find the true frequency of an atomic transition without cooling a sample down to temperatures at which the Doppler broadening is minimal.
Spectroscopy | Raman spectroscopy | Infrared spectroscopy | spectroscopy | Pittsburgh Conference on Analytical Chemistry and Applied Spectroscopy | Fourier transform infrared spectroscopy | Nuclear magnetic resonance spectroscopy | Near-infrared spectroscopy | Mössbauer spectroscopy | Absorption spectroscopy | Ultraviolet–visible spectroscopy | Ultraviolet-visible spectroscopy | ultraviolet–visible spectroscopy | Ultrasound attenuation spectroscopy | Soft X-ray emission spectroscopy | Saturated model | Saturated absorption spectroscopy | Positron annihilation spectroscopy | Photoemission spectroscopy | photoemission spectroscopy | nuclear magnetic resonance spectroscopy | Fourier transform spectroscopy | Atomic Spectroscopy | Atomic spectroscopy |