SPECTROSCOPY OF NEUTRAL RETINAL AND GFP CHROMOPHORES IN THE GAS PHASE

In this contribution, we discuss aspects of spectral tuning of molecular chromophores at the atomic level. The basis for the discussion is a series of measurements performed at the electrostatic ion-storage ring ELISA at the University of Aarhus. The experimental technique, which is a type of “action spectroscopy” based on photo dissociation, will briefly be discussed. We will present examples of spectral tuning due to external charges and proton exchange with the hosting medium.