Editing Plasma diagnostics (section)

===Doppler broadening===
The thermal motion of ions will result in a shift of emission lines up or down, depending on whether the ion is moving toward or away from the observer. The magnitude of the shift is proportional to the velocity along the line of sight. The net effect is a characteristic broadening of spectral lines, known as [[Doppler broadening]], from which the ion temperature can be determined.<ref>{{cite journal |last1=Gradic  |first1=D. |last2=Ford |first2=O.P. |display-authors=1|title=Doppler coherence imaging of divertor and SOL flows in ASDEX upgrade and Wendelstein 7-X |journal=Plasma Physics and Controlled Fusion |date=2018 |volume=60 |issue=8|pages=084007|doi=10.1088/1361-6587/aac4d2 |bibcode=2018PPCF...60h4007G |s2cid=125817653 |doi-access=free }}</ref>