X-ray jump ratio

https://doi.org/10.1351/goldbook.09442
X-ray absorption coefficient at an energy just above an absorption edge divided by that at an energy just below the edge.
Note: X-ray absorption spectra can have complex shapes for X-ray energies in the vicinity of photoionization thresholds, and a well-defined edge is not always observed at the threshold.
Source:
PAC, 2020, 92, 1781. (Glossary of methods and terms used in surface chemical analysis (IUPAC Recommendations 2020)) on page 1850 [Terms] [Paper]