diagram line

in X-ray spectroscopy
https://doi.org/10.1351/goldbook.D01664
See:
characteristic X-ray emission
,
X-ray satellite
Source:
PAC, 1991, 63, 735. (Nomenclature, symbols, units and their usage in spectrochemical analysis - VIII. Nomenclature system for X-ray spectroscopy (Recommendations 1991)) on page 737 [Terms] [Paper]