Disclosing the physical origin of quantum beatings in the early dynamics of biological light-harvesting pigment-protein complexes is one of the major challenges in the ultrafast spectroscopy community. 2D electronic spectroscopy (2DES) is a powerful tool for this purpose, but the complexity of the beating behavior in multichromophoric systems complicates the interpretation. For this reason, the availability of control datasets providing a full characterization of the response of isolated chromophores is highly desirable to untangle the features of intermolecular interactions from the properties of individual pigments. Here, a thorough 2DES characterization of the frequencies and dephasing times of intramolecular vibrational coherences of bacteriochlorophyll a in solution is provided. Several beating modes in the ground and excited state have been found and their dephasing times have been determined. The obtained results represent an essential interpretation key of the beating dynamics of pigment-protein complexes binding bacteriochlorophyll a.

在生物光捕获色素-蛋白质复合物的早期动力学中揭示量子跳动的物理起源是超快光谱学界的主要挑战之一。2D电子光谱法（2DES）是实现此目的的强大工具，但是在多发色系统中打浆行为的复杂性使解释变得复杂。由于这个原因，非常需要控制数据集提供孤立生色团的响应的完整特征，以使分子间相互作用的特征与单个颜料的性质脱开。在这里，彻底的2DES表征细菌叶绿素a的分子内振动相干的频率和相移时间提供了解决方案。已经找到了几种在基态和激发态下的跳动模式，并确定了它们的移相时间。获得的结果代表了结合细菌叶绿素a的色素-蛋白质复合物的跳动动力学的基本解释关键。