One
mole of photons. Although widely used, it is not an IUPAC sanctioned unit. It is sometimes
defined as the energy of one
mole of photons. This use is discouraged.
Source:
PAC, 1996, 68, 2223
(Glossary of terms used in photochemistry (IUPAC Recommendations 1996))
on page 2238
See also:
PAC, 1990, 62, 2167
(Glossary of atmospheric chemistry terms (Recommendations 1990))
on page 2186