Absorbance, Order Parameter, and Dichroic Ratio Measurement

2 Absorbance, Order Parameter, and Dichroic Ratio Measurement 

In the above expression the effect of the internal field is not taken into account. The correction to Ay and A (or Tn and T ) yields a slightly different value for the order parameter [42]  

Usually the absorption (or transmission) spectrum is run and recorded in parallel or perpendicular geometry over the range 380-780 nm. From these measurements Amax 11. and A are determined [42]. An and Aj are measured at Amax - Unless specified, the order parameter is usually calculated at Amax- - 11 (A) and A (X) have also been calculated by keeping the polarizers parallel to 

The order parameter of a dye with a very wide absorption spectrum, or a black dye, can be calculated using Eq. (5), but the dichroic ratio is then evaluated over the whole visible spectrum  

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