Ultraviolet-Ultraviolet Hole Burning Spectroscopy in a Quadrupole Ion Trap: Dibenzo[18]crown-6 Complexes with Alkali Metal Cations

摘要

Since its first introduction more than two decades ago, ultraviolet-ultraviolet (UV-UV) hole burning (HB) spectroscopy has been extensively used for molecules and clusters produced in a supersonic jet to determine the number of different conformational isomers present in the jet as well as to obtain the conformationally selective electronic spectra. Conformation-selective electronic spectroscopy is crucial for the studies of large organic molecules or biomolecules in the gas phase, which generally exhibit congested and broadened spectral features because of the overlap of the vibronic peaks of different conformers.