Increase in the theoretical width of a
spectral line owing to thermal motion of emitting atoms (Doppler effect), to electric field (Stark effect), to self-absorption and to pressure (Lorentz effect).
Note:
Line-broadening increases the measurement uncertainty of a measurement.
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 724 (https://doi.org/10.1515/pac-2019-0203)