coupling constant (spin-spin), \(J\)
A quantitative measure for nuclear spin-spin, nuclear-electron (@HT07052@) and electron-electron (fine @C01025@ in EPR) @C01025@ in magnetic @R05326@ @S05848@. The 'indirect' or scalar NMR @C01025@ constants are in a first approximation independent of the external magnetic field and are expressed in \(\mathrm{Hz}\).
PAC, 1994, 66, 1077. (Glossary of terms used in physical organic chemistry (IUPAC Recommendations 1994)) on page 1101 [Terms] [Paper]