## spectral responsivity

https://doi.org/10.1351/goldbook.S05829
The spectral output quantity of a system such as a photomultiplier, diode array, @[email protected] device, or biological unit divided by the @[email protected] $$s(\lambda) = \frac{\text{d}y\left(\lambda \right)}{\text{d}E\left(\lambda \right)}$$, simplified expression: $$s(\lambda) = \frac{Y_{\lambda }}{E_{\lambda }}$$, where $$Y_{\lambda }$$ is the magnitude of the output signal for @[email protected] at @[email protected] $$\lambda$$ and $$E_{\lambda }$$ is the @[email protected] of the parallel and perpendicular incident beam at the same @[email protected]