retardation factor, \(R\)

in column chromatography
https://doi.org/10.1351/goldbook.R05352
The fraction of the sample component in the mobile phase at equilibrium; it is related to the retention factor and other fundamental @C01075@ terms: \[R = \frac{1}{k\,+\,1}\]
Source:
PAC, 1993, 65, 819. (Nomenclature for chromatography (IUPAC Recommendations 1993)) on page 843 [Terms] [Paper]