Preparation and photoelectron spectrum of the glycine molecular anion:Assignment to a dipole-bound electron species with a high-dipole moment,non-zwitterionic form of the neutral core

摘要

We report the gas-phase preparation of negatively charged glycine as well as the Gly centre dot(H_2O)~(1,2)~-complexes by entrainment of the neutral precursor into an ionized supersonic expansion tuned to optimize the (H_2O)_n~- centre dot Ar_m clusters.The photoelectron spectrum of Gly~- displays the signature of a dipole-bound species,with sufficient vibrational fine structure to characterize the core neutral as a higher energy,non-zwitterionic isomer of the amino acid.