Department of Chemistry, Institute for Optical Sciences, and Centre for Quantum Information and Quantum Control, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada.
Phys Chem Chem Phys. 2012 Apr 14;14(14):4857-74. doi: 10.1039/c2cp23670b. Epub 2012 Feb 29.
Recent measurements using two-dimensional electronic spectroscopy (2D ES) have shown that the initial dynamic response of photosynthetic proteins can involve quantum coherence. We show how electronic coherence can be differentiated from vibrational coherence in 2D ES. On that basis we conclude that both electronic and vibrational coherences are observed in the phycobiliprotein light-harvesting complex PC645 from Chroomonas sp. CCMP270 at ambient temperature. These light-harvesting antenna proteins of the cryptophyte algae are suspended in the lumen, where the pH drops significantly under sustained illumination by sunlight. Here we measured 2D ES of PC645 at increasing levels of acidity to determine if the change in pH affects the quantum coherence; quantitative analysis reveals that the dynamics are insensitive to the pH change.
最近使用二维电子光谱（2D ES）的测量结果表明，光合作用蛋白的初始动态响应可能涉及量子相干。我们展示了如何在 2D ES 中区分电子相干和振动相干。在此基础上，我们得出结论，在常温下，从 Chroomonas sp. CCMP270 中提取的藻红蛋白捕光复合物 PC645 中可以观察到电子相干和振动相干。这些隐藻的光捕获天线蛋白悬浮在腔室中，在阳光持续照射下，腔室中的 pH 值会显著下降。在这里，我们测量了 PC645 在不断增加的酸度下的 2D ES，以确定 pH 值的变化是否会影响量子相干；定量分析表明，动力学对 pH 值的变化不敏感。
