Upper frequency minus lower frequency in a continuous band of frequencies.
Note:
SI unit: hertz, \(\pu{Hz}\).
Source:
PAC, 2021, 93, 647. 'Glossary of methods and terms used in analytical spectroscopy (IUPAC Recommendations 2019)' on page 673 (https://doi.org/10.1515/pac-2019-0203)