Photoelectron spectroscopy of gramicidin polyanions: competition between delayed and direct emission.
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.
Matheis
Katerina
K
Institut für Physikalische Chemie, Universität Karlsruhe, Kaiserstrasse 12, D-76128 Karlsruhe, Germany.
Joly
Laure
L
Antoine
Rodolphe
R
Lépine
Franck
F
Bordas
Christian
C
Ehrler
Oli T
OT
Allouche
Abdul-Rahman
AR
Kappes
Manfred M
MM
Dugourd
Philippe
P
D001407:Bacillus / Q000737:chemistry; D004583:Electrons; D006096:Gramicidin / Q000737:chemistry*; D007700:Kinetics; D008958:Models, Molecular; D008968:Molecular Conformation; D000071228:Polyelectrolytes; D011108:Polymers / Q000737:chemistry*; D013057:Spectrum Analysis
D006096:Gramicidin; D000071228:Polyelectrolytes; D011108:Polymers