Spectroscopic investigation on the efficient organic nonlinear crystals of pure and diethanolamine added DAST

- The strongest vibrational modes contributing to the electro optic effect were identified.
- The energy of HOMO and LUMO explained the eventual charge transfer interaction within the molecule.
- The density of states of the system showed the energy levels available to be occupied by electrons.
- The strong peak at 609 nm indicated the yellow-orange emission.