Glossary of Terms Used in Photochemistry
[A] [B] [C]
[D] [E] [F]
[G] [H] [I]
[J] [K] [L]
[M]
[N] [O] [P]
[Q] [R] [S]
[T] [U] [V] [W]
[X] [Y] [Z]
WAVELENGTH (
)
The distance, measured along the line of propagation, between two
corresponding points on adjacent waves. The wavelength depends on
the medium in which the wave propagates.
WAVENUMBER 
The reciprocal of the wavelength, ,
or the number of waves per unit length along the direction of propagation.
The SI unit is m-1, but a commonly used unit is cm-1.
WELLER CORRELATION
Empirical correlation for the energy of full charge-transfer exciplexes
relative to the ground-state in n-hexane as a function of the electrochemical
one electron oxidation and reduc-tion potentials measured in a polar
solvent for the donor (D) and the acceptor (A) involved (see e.g.:
A. Weller, in "The Exciplex", Gordon and Ware eds., Academic Press
Inc., N. Y., 1975):
WIGNER RULE
See spin conservation rule.
WOOD HORN
A mechanical device that acts by absorption as a perfect photon trap.
WOOD LAMP
A term used to describe a low-pressure mercury arc.
See lamp.
