Photoelectron spectroscopy of gramicidin polyanions: competition between delayed and direct emission.
Photoelectron spectroscopy of gramicidin polyanions: competition between delayed and direct emission.
复制标题
短杆菌肽聚阴离子的光电子能谱：延迟发射和直接发射之间的竞争。
DOI：
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发表时间：
2008
影响因子：
15
通讯作者：
P. Dugourd
中科院分区：
文献类型：
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作者：
Katerina Matheis;L. Joly;R. Antoine;F. Lépine;C. Bordas;Oli T. Ehrler;A. Allouche;M. Kappes;P. Dugourd
我们提出了多肽聚阴离子的第一光电子（PE）谱。结合PE光谱和质谱提供了一个直接测量的聚阴离子的稳定性相对于电子脱离和多余的电荷之间的排斥能。发现短杆菌肽的第二电子亲和力为2.35 +/- 0.15 eV，并且排斥库仑势垒的值估计为0.5 +/- 0.15 eV。光谱被解释为延迟和直接发射之间的竞争。
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.