CAREER: Detecting Quantum Signatures in Nonadiabatic Molecular Dynamics

职业：检测非绝热分子动力学中的量子特征

• 批准号: 2340180
• 负责人: Melanie Reber
• 金额: $ 67.5万
• 依托单位: University of Georgia Research Foundation Inc
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-01-01 至 2028-12-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2340180&HistoricalAwards=false
• 关键词: CAREER; Detecting; Quantum; Signatures; Nonadiabatic; CAREER; Detecting; Quantum; Signatures; Nonadiabatic

With support from the Chemical Structure, Dynamics, and Mechanisms A (CSDM-A) program in the Division of Chemistry, Melanie Reber of the University of Georgia is developing methods capable of measuring transient changes in the absorption spectra of molecules in the gas phase. Gas phase measurements, specifically in a molecular beam, allow for detailed study of the role of vibrations in excited state processes with a direct comparison to theoretical predictions. Molecular beams provide a cold and controlled environment for generating and studying small molecules but require high detection sensitivity due to the low number densities. Professor Reber and her students will use optical enhancement cavities to increase the detection sensitivity of ultrafast transient absorption spectroscopy. Their discoveries could lead to a more complete understanding of conical intersections in vibrational excited states of organic molecules and radicals. As part of the educational component, Dr. Reber will explore how the use of art and music in teaching science impacts student learning and retention of students from all backgrounds. The students involved in the project will gain highly technical training in lasers, optics, and electronics relevant to a range of high technology fields including quantum technologies. To broaden participation and awareness of the interdisciplinary fields of physical chemistry and quantum science, Dr. Reber will teach a class for incoming first-year undergraduate students to introduce them to the science, technology, and application of quantum science.The project will look at the molecular dynamics around conical intersections with both ultrafast time resolution and high spectral resolution for a detailed characterization of the dynamics. This includes the development of new instrumental techniques that study ultrafast dynamics of molecules in the gas phase with both ultrafast time resolution and high-resolution detection. The team uses ultrafast frequency comb fiber lasers in the visible and infrared spectral regions and couples them to external optical enhancement cavities to increase the signal. This enables study of dilute species in molecular beams with ultrafast transient absorption spectroscopy. Dual comb detection techniques will be developed to provide quantum-state resolution on the absorption spectra of the resultant species. The overarching objective is to study conical intersections in excited electronic states and conical intersections between vibrational states, such as Jahn-Teller interactions. This study aims to provide a detailed description of the dynamics in the gas phase for direct comparison with theory and a more complete picture of the quantum effects in the dynamics.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

在化学结构，动力学和机制A（CSDM-A）计划的支持下，佐治亚大学的Melanie Reber正在开发能够测量气相中分子吸收光谱的短暂变化的方法。气相测量，特别是在分子束中，可以详细研究振动在激发状态过程中的作用，并与理论预测直接比较。分子束提供了一个冷且受控的环境，用于产生和研究小分子，但由于数量较低而需要高检测灵敏度。 Reber教授和她的学生将使用光学增强腔来提高超快瞬态吸收光谱的检测灵敏度。他们的发现可能会导致对有机分子和自由基振动激发态的圆锥形交集有更完整的理解。作为教育组成部分的一部分，雷伯博士将探讨艺术和音乐在教学中的使用如何影响学生的学习和从各个背景的学生保留。 参与该项目的学生将在激光，光学和电子设备中获得与一系列高科技领域有关的高度技术培训，包括量子技术。为了扩大对物理化学和量子科学跨学科领域的参与和认识，雷伯博士将教一门课程，以介绍入学的一年级本科生，将它们介绍给量子科学的科学，技术和应用。该项目将探讨围绕圆锥形的动力学围绕圆锥形的动态，以超出时间分辨率和高光谱分辨率分辨率和高谱分辨率分辨出均一的动态特征，以均动态化。这包括开发新的仪器技术，这些技术在气相中研究了分子的超快动力学，并既分辨率又分辨率检测。该团队在可见的和红外光谱区域使用超快速频率纤维激光器，并将它们与外部光学增强腔融合在一起以增加信号。这种可以研究具有超快瞬态吸收光谱的分子束中的稀释物种。将开发双梳检测技术，以在所得物种的吸收光谱上提供量子状态分辨率。总体目标是研究激发电子状态和振动状态之间（例如Jahn-Teller相互作用）之间的圆锥形交集的圆锥形交集。这项研究旨在详细描述气相中的动力学，以直接与理论进行直接比较，并更完整地了解动态效果。该奖项反映了NSF的法定任务，并被认为是值得通过基金会的智力优点和更广泛影响的审查标准通过评估来进行评估的。