 The MCD signal ΔA is derived via the absorption of the LCP and RCP light as

This signal is often presented as a function of wavelength λ, temperature T or magnetic field H. MCD spectrometers can simultaneously measure absorbance and ΔA along the same light path.This eliminates error introduced through multiple measurements or different instruments that previously occurred before this advent.The MCD spectrometer example shown below begins with a light source that emits a monochromatic wave of light.