Dynamics of Polyatomic Molecules in Intense Laser Fields

强激光场中多原子分子的动力学

• 批准号: 9976476
• 负责人: Robert Levis
• 金额: $ 34.1万
• 依托单位: Wayne State University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-08-15 至 2002-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9976476&HistoricalAwards=false
• 关键词: Dynamics; Polyatomic; Molecules; Intense; Laser

Robert Levis of Wayne State University is supported by the Experimental Physical Chemistry Program for research that focuses on the interaction of polyatomic molecules with intense near-infrared laser pulses of femtosecond duration. The objectives of this project are to elucidate the coupling mechanism between an intense laser and a polyatomic molecule, to understand the factors leading to dissociation during intense laser ionization, and to develop a time-dependent picture of the radiation molecule interaction. Photoelectron spectroscopy and time-of-flight mass spectrometry measurements will delineate the coupling mechanisms for various classes of molecules, revealing the experimental observables of ionization and dissociation probability and the electron kinetic energy distributions. Energy partitioning between electronic and nuclear degrees of freedom will be determined from fragment ion kinetic energy distributions and electron-ion coincidence experiments. Finally, time-resolved experiments will provide a detailed picture of the evolution of a molecule in an intense laser field. Extremely intense light induces far different behaviors in molecules than does the same color, but weaker light. The ability of intense light to result in unusual dissociation and ionization processes is assisting in the development of novel optical methods such as high harmonic generation devices and x-ray lasers. Outcomes from these studies have potential applications in a universal ionization method for biological mass spectrometry, new detection methods for chemical reaction dynamics, and methods for coherent control.

韦恩州立大学的罗伯特·李维斯得到了实验物理化学项目的支持，其研究重点是多原子分子与飞秒持续时间的强近红外激光脉冲的相互作用。该项目的目标是阐明强激光和多原子分子之间的耦合机制，了解强激光电离过程中导致解离的因素，并开发辐射分子相互作用的时间依赖性图像。 光电子能谱和飞行时间质谱测量将描绘各类分子的耦合机制，揭示电离和解离概率以及电子动能分布的实验观测值。 电子和核自由度之间的能量分配将由碎片离子动能分布和电子-离子符合实验确定。 最后，时间分辨实验将提供强激光场中分子演化的详细图片。 极强的光在分子中引起的行为与相同颜色但较弱的光截然不同。 强光能够导致不寻常的解离和电离过程，这有助于开发新型光学方法，例如高次谐波发生装置和 X 射线激光器。这些研究成果在生物质谱的通用电离方法、化学反应动力学的新检测方法以及相干控制方法方面具有潜在的应用前景。