Question

Explain why the transmission spectrum is calculated from the quotient (sample transform) M(background transform) instead of the difference (sample transform) - (background transform).

Short answer

The transmittance spectrum was explained using the quotient (sample transform / background transform) rather than the difference (sample transform) (background transform).

Step-by-step solution

Definition of transmission spectrum

• Because more light is passed through the sample, the maximum intensities of a transmission spectrum will be at wavelengths where the absorption is weakest.
• The maximum intensities in an absorption spectrum occur at wavelengths where the absorption is strongest.

Determine the transmission spectrum is calculated from the quotient (sample transform) M (background transform) instead of the difference (sample transform) - (background transform).

• The transmittance spectrum must be stated using the quotient (sample transform / background transform) rather than the difference (sample transform) (background transform).
• The background correction is a measurement of the sample's transmittance by comparing it to the backdrop's transmittance, which is utilised in the background correction.
• The background transform observes the incident irradiance Po, while the sample transform observes the transmitted irradiance P.
• As a result, the transmittance is,$\frac{\mathrm{P}}{{\mathrm{P}}_{\mathrm{o}}}$ not$\mathrm{P}‐{\mathrm{P}}_{\mathrm{o}}$
• The transmittance spectrum was explained using the quotient (sample transform / background transform) rather than the difference (sample transform) (background transform).