Electroabsorption studies of polyaniline

We present the results of electroabsorption measurements of emeraldine base and a related phenyl capped tetramer, both spun from NMP. A comparison of the data of the two materials shows many similarities, indicating that the electronic structures are similar. Kramers-Kronig analysis has been used to calculate the third order non-linear susceptibility χ(3)(-ω;ω,0,0) as a function of energy. The values of χ(3) are at a maximum around 1.6 eV with values of the order 3 × 10−11 esu.