absorbed (spectral) radiant power density

https://doi.org/10.1351/goldbook.AT07313
spectral radiant energy per time interval (spectral radiant power, \(P_{\lambda}\)) absorbed by a system per volume, \(V\). SI unit is \(\text{W m}^{-4}\); common unit is \(\text{W cm}^{-3}\ \text{nm}^{-1}\).
Note:
Mathematical expression: \(\frac{P_{\lambda}^{0}[1 - 10^{-A(\lambda)}]}{V}\), where \(A(\lambda)\) is the @A00028@ at @W06659@\(\lambda\) and superscript \(0\) (zero) indicates incident @R05046@.
Source:
PAC, 2007, 79, 293. 'Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)' on page 297 (https://doi.org/10.1351/pac200779030293)