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Electronic Spectroscopy in the Gas Phase

  1. David W. Pratt

Published Online: 15 SEP 2011

DOI: 10.1002/9780470749593.hrs054

Handbook of High-resolution Spectroscopy

Handbook of High-resolution Spectroscopy

How to Cite

Pratt, D. W. 2011. Electronic Spectroscopy in the Gas Phase. Handbook of High-resolution Spectroscopy. .

Author Information

  1. University of Pittsburgh, Department of Chemistry, Pittsburgh, PA, USA

Publication History

  1. Published Online: 15 SEP 2011

Abstract

A frequency-doubled continuous wave (CW) ring dye laser, operating in the ultraviolet (UV), has been combined with a molecular beam machine and rapid data acquisition methods to obtain the electronic spectra of several large polyatomic molecules and their weakly bound complexes at unparalleled spectral resolution, approaching one part in 109. Thus revealed for the first time are the underlying molecular eigenstates of isolated molecules, which provide unique information about their structures and dynamical behavior in both ground and excited electronic states. Light-induced changes in the electronic charge distributions of different electronic states, with or without the attached solvent molecules, are revealed by studies of these spectra in applied electric fields (the Stark effect). Potential applications of the method to small biological molecules are discussed.

Keywords:

  • high-resolution electronic spectroscopy;
  • UV/vis;
  • conformational analysis;
  • electronic transition moments;
  • permanent electric dipole moments;
  • Stark effect;
  • van der Waals complexes;
  • hydrogen bonding;
  • tunneling;
  • intramolecular dynamics;
  • biomolecules