Single-shot ultrabroadband two-dimensional electronic spectroscopy of the light-harvesting complex LH2.
Single-shot ultrabroadband two-dimensional electronic spectroscopy of the light-harvesting complex LH2.
复制标题
光捕获复合物 LH2 的单次超宽带二维电子光谱。
作者：
E. Harel;P. Long;G. Engel
在这里，我们使用带宽超过100 nm FWHM的相干脉冲，展示了紫色细菌的光收集配合物LH2的二维（2D）电子光谱。这种宽带激发和检测允许使用单个光源同时捕获B800和B850波段。我们证明了一个激光脉冲足以以高信噪比捕获整个二维电子谱。在800 fs的等待时间内，我们观察到种群从B800向B850的转移，表现为一个显著的交叉峰。这些结果将使我们能够同时在超快（< 1ps）和较慢（bbb1ms）时间尺度上观察生物系统的动力学。
Here we present two-dimensional (2D) electronic spectra of the light-harvesting complex LH2 from purple bacteria using coherent pulses with bandwidth of over 100 nm FWHM. This broadband excitation and detection has allowed the simultaneous capture of both the B800 and B850 bands using a single light source. We demonstrate that one laser pulse is sufficient to capture the entire 2D electronic spectrum with a high signal-to-noise ratio. At a waiting time of 800 fs, we observe population transfer from the B800 to B850 band as manifested by a prominent cross peak. These results will enable observation of the dynamics of biological systems across both ultrafast (<1 ps) and slower (>1 ms) timescales simultaneously.