Excited state Wavelengthλ(nm) Experimental Theoretical Excitation energy(eV) Oscillator strength(f) S1 240.19 267.96 4.6270 0.1442 S2     - 263.03 4.7137 0.0074 S3     - 260.36 4.7620 0.6156

Table 6: Experimental and Theoretical electronic absorption spectra values of p-Arsanilic acid using TD-DFT/B3LYP/6-31+G**.