Observation of Ultrafast Charge Migration in an Amino Acid

被引：107

作者：

Belshaw, Louise ^{[1
]}

Calegari, Francesca ^{[2
]}

Duffy, Martin J. ^{[1
]}

Trabattoni, Andrea ^{[2
]}

Poletto, Luca ^{[3
]}

Nisoli, Mauro ^{[2
]}

Greenwood, Jason B. ^{[1
]}

机构：

[1] Queens Univ Belfast, Sch Math & Phys, Ctr Plasma Phys, Belfast BT7 1NN, Antrim, North Ireland

[2] Politecn Milan, Dept Phys, Inst Photon & Nanotechnol, CNR IFN, I-20133 Milan, Italy

[3] CNR IFN, Inst Photon & Nanotechnol, I-35131 Padua, Italy

来源：

JOURNAL OF PHYSICAL CHEMISTRY LETTERS | 2012年 / 3卷 / 24期

基金：

欧洲研究理事会; 英国工程与自然科学研究理事会;

关键词：

ELECTRON-TRANSFER; IONIZATION; FEMTOSECOND; PHOTOIONIZATION; DYNAMICS; DRIVEN;

D O I：

10.1021/jz3016028

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We present the first direct measurement of ultrafast charge migration in a biomolecular building block the amino acid phenylalanine. Using an extreme ultraviolet pulse of 1.5 fs duration to ionize molecules isolated in the gas phase, the location of the resulting hole was probed by a 6 fs visible/near-infrared pulse. By measuring the yield of a doubly charged ion as a function of the delay between the two pulses, the positive hole was observed to migrate to one end of the cation within 30 fs. This process is likely to originate from even faster coherent charge oscillations in the molecule being dephased by bond stretching which eventually localizes the final position of the charge. This demonstration offers a clear template for observing and controlling this phenomenon in the future.

引用

页码：3751 / 3754

页数：4

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