1. Regions of @P04780@ where there are valleys are sometimes referred to as arrangement channels. The @R05163@ channel or @E02148@ is that corresponding to configurations similar to those of the reactants; the @P04861@ channel or @E02265@ relates to configurations similar to those of the products. In @C01170@, the specification of a complete set of quantum numbers in a given arrangement channel is called a channel.
    See also:
    entrance channel
    exit channel
    PAC, 1996, 68, 149. (A glossary of terms used in chemical kinetics, including reaction dynamics (IUPAC Recommendations 1996)) on page 157 [Terms] [Paper]
  2. That part of an @A00333@ that is dedicated to a single analytical procedure, including the @T06437@. This term relates to the internal operation of certain types of instruments, particularly in clinical chemistry. The general term channel has a much broader meaning, and the term is not recommended.
    PAC, 1989, 61, 1657. (Nomenclature for automated and mechanised analysis (Recommendations 1989)) on page 1661 [Terms] [Paper]