Photoelectron Spectroscopy of Gramicidin Polyanions: Competition between Delayed and Direct Emission
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- 作者：Katerina Matheis ; Laure Joly ; Rodolphe Antoine ; Franck Lé ; pine ; Christian Bordas ; Oli T. Ehrler ; Abdul-Rahman Allouche ; Manfred M. Kappes ; Philippe Dugourd
- 刊名：Journal of the American Chemical Society
- 出版年：2008
- 出版时间：November 26, 2008
- 年：2008
- 卷：130
- 期：47
- 页码：15903-15906
- 全文大小：209K
- 年卷期：v.130,no.47(November 26, 2008)
- ISSN：1520-5126
文摘
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.