Photoelectron spectroscopy of gramicidin polyanions: competition between delayed and direct emission.

作者信息

Matheis Katerina, Joly Laure, Antoine Rodolphe, Lépine Franck, Bordas Christian, Ehrler Oli T, Allouche Abdul-Rahman, Kappes Manfred M, Dugourd Philippe

机构信息

Institut für Physikalische Chemie, Universität Karlsruhe, Kaiserstrasse 12, D-76128 Karlsruhe, Germany.

出版信息

J Am Chem Soc. 2008 Nov 26;130(47):15903-6. doi: 10.1021/ja803758w.

DOI:10.1021/ja803758w

PMID:18975871

Abstract

We present the first photoelectron (PE) spectra of polypeptide polyanions. Combining PE spectroscopy and mass spectrometry provides a direct measurement of the stability of the polyanions with respect to electron detachment and of the repulsive energy between excess charges. The second electron affinity of gramicidin was found to amount to 2.35 +/- 0.15 eV, and the value of the repulsive Coulomb barrier was estimated to be 0.5 +/- 0.15 eV. The spectra are interpreted as resulting from a competition between delayed and direct emission.

摘要