Normal modes and the Duschinsky mixing of the ground- and excited-state vibrations of the green fluorescent protein chromophore

- Vibrational frequencies of GFP chromophore were calculated for the ground and excited states.
- Detailed normal mode analysis were carried out for all the states.
- Duschinsky relation were applied to understand the mixing of mode between different states.
- Modes responsible for the shifting of the equlibrium position were identified.
- Collective motion of low frequencies modes responsible for the detachment of phenolic proton.