Photoemission and Photoabsorption Spectroscopy of Glycyl-Glycine in the Gas Phase

The high-resolution outer and inner valence band (VB) spectra, as well as core level X-ray photoemission (XPS) and near edge X-ray absorption fine structure (NEXAFS) spectra at the carbon, nitrogen, and oxygen K-edges of glycyl-glycine in the gas phase have been measured, and the results interpreted...

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Bibliographic Details
Published in:The journal of physical chemistry. A, Molecules, spectroscopy, kinetics, environment, & general theory Molecules, spectroscopy, kinetics, environment, & general theory, 2009-10, Vol.113 (40), p.10726-10733
Main Authors: Feyer, Vitaliy, Plekan, Oksana, Richter, Robert, Coreno, Marcello, Prince, Kevin C, Carravetta, Vincenzo
Format: Article
Language:English
Subjects:
A: Kinetics, Spectroscopy
Electron Transport
Glycine - chemistry
Glycylglycine - chemistry
Hydrogen Bonding
Models, Molecular
Phase Transition
Photochemistry
Photoelectron Spectroscopy
Protein Conformation
X-Ray Absorption Spectroscopy
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Summary:The high-resolution outer and inner valence band (VB) spectra, as well as core level X-ray photoemission (XPS) and near edge X-ray absorption fine structure (NEXAFS) spectra at the carbon, nitrogen, and oxygen K-edges of glycyl-glycine in the gas phase have been measured, and the results interpreted by means of ab initio calculations. By comparison with our previous glycine spectra, the features characteristic of the peptide bond in the carbon, nitrogen, and oxygen XPS and NEXAFS spectra of glycyl-glycine have been identified and assigned. The K-edge NEXAFS spectra at all edges were found to be in reasonable agreement with published electron energy loss spectra, but showed more prominent structure due to the higher resolution. Effects on the nitrogen K-edge NEXAFS spectrum of glycyl-glycine due to intramolecular hydrogen bonding were observed. The N(NH2) 1s → π*CN resonance shifts to 0.6 eV lower energy, due to internal hydrogen bonding between the NH2 and NH groups.
ISSN:1089-5639
1520-5215
DOI:10.1021/jp906843j