Waveform Synthesis of Attosecond Optical Pulses: A Common Route to Attosecond Pump-Probe Spectroscopy and Nanoscopy in Aqueous Solution

阿秒光脉冲的波形合成：水溶液中阿秒泵浦探针光谱学和纳米显微镜学的共同途径

• 批准号: RGPIN-2015-06208
• 负责人: BeaudoinBertrand, Julien
• 金额: $ 2.4万
• 依托单位: Université Laval
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2017
• 资助国家: 加拿大
• 起止时间: 2017-01-01 至 2018-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=633164
• 关键词: Waveform; Synthesis; Attosecond; Optical; Pulses

When a molecule absorbs light, its electronic cloud reacts almost instantaneously followed by rovibrational nuclear dynamics on the femtosecond (fs=10-15s.) to picosecond (ps=10-12s.) timescale. In photosynthesis, for example, the absorption of ultraviolet light by chlorophyll molecules induces an electronic dipole oscillation, which has a period in the range of 1 fs, followed by its slower decay and energy redistribution to the nuclear degrees of freedom. Over the last decades, time-resolved spectroscopy showed how few-cycle femtosecond laser pulses can be used to steer nuclear wave packets and control the outcome of elementary reactions. The lack of shorter pulses, however, has left control of the electron wave packets on the sub-oscillation period timescale unexplored. Would it be possible to follow and, ultimately, more efficiently control reaction dynamics right from the earliest moments when electron dipole forces initiate nuclear motion?

当一个分子吸收光时，它的电子云几乎立即发生反应，随后是在飞秒（fs=10-15秒）到皮秒（ps=10-12秒）时间尺度上的旋转核动力学。例如，在光合作用中，叶绿素分子对紫外光的吸收引起电子偶极子振荡，其周期在1fs范围内，随后是其较慢的衰变和能量重新分配到核自由度。在过去的几十年里，时间分辨光谱学显示了如何使用短周期飞秒激光脉冲来引导核波包和控制基本反应的结果。然而，由于缺乏更短的脉冲，对亚振荡周期时间尺度上的电子波包的控制仍未得到探索。是否有可能跟踪并最终更有效地控制从电子偶极力引发核运动的最早时刻开始的反应动力学？