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RUI: Driving Forbidden Vibrational Overtones in Trapped Molecular Ions

RUI：驱动被捕获分子离子中禁止的振动泛音

基本信息

批准号：
1806223
负责人：
David Hanneke
金额：
$ 29.74万
依托单位：
Amherst College
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2018
资助国家：
美国
起止时间：
2018-09-01 至 2023-08-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1806223&HistoricalAwards=false
关键词：
RUI Driving Forbidden Vibrational Overtones

项目摘要

Some atoms and molecules have quantum states with properties that are particularly well-suited for timekeeping, for quantum information processing, or for tests of physical laws. This project focuses on molecular vibrations that are sensitive to fundamental constants such as the electron mass and the proton mass. These vibrations occur when atomic nuclei stretch and compress a chemical bond, and their vibration frequencies depend on the proton-to-electron mass ratio. This team will conduct a proof-of-principle experiment using vibrational states to search for time dependent changes in fundamental constants. Such changes are predicted by some models of quantum gravity or dark matter, but have not yet been detected experimentally. This project promotes the progress of science by developing new ways to study molecular vibrations as precision tests of fundamental physics. This research takes place at a liberal arts college where undergraduate students are involved in all aspects of the work. In addition to training the next generation of scientists, this work develops skills in experimental physics that are transferable to a wide array of future endeavors.This project will investigate electric-dipole-forbidden vibrational overtones in trapped molecular ions. The team will drive an overtone as a two-photon transition in the diatomic oxygen molecular ion, which is of long-term interest as both an optical molecular clock and as a probe for time-variation of the proton-to-electron mass ratio. The nonpolar nature of the molecule suppresses systematic shifts related to electric fields, such as AC Stark shifts and blackbody radiation. A key tool for this work is a stable optical local oscillator that is referenced to a separate optical clock. To demonstrate the promise of this system, this team will reduce the uncertainty on an overtone transition frequency by several orders of magnitude and monitor it over the course of a year.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.

一些原子和分子具有量子态，其特性特别适合于计时、量子信息处理或物理定律的测试。这个项目的重点是对基本常数如电子质量和质子质量敏感的分子振动。这些振动发生在原子核拉伸和压缩化学键时，它们的振动频率取决于质子与电子的质量比。这个团队将进行一个原理验证实验，利用振动状态来寻找基本常数中随时间变化的变化。一些量子引力或暗物质模型预测了这种变化，但尚未在实验中检测到。这个项目通过开发新的方法来研究分子振动，作为基础物理的精确测试，促进了科学的进步。这项研究在一所文理学院进行，本科生参与了研究的各个方面。除了培养下一代科学家之外，这项工作还培养了实验物理方面的技能，这些技能可以应用到未来的一系列工作中。该项目将研究捕获的分子离子中的电偶极子禁止振动泛音。该团队将在双原子氧分子离子中驱动双光子跃迁的泛音，作为光学分子钟和质子与电子质量比随时间变化的探针，这是一个长期的兴趣。分子的非极性性质抑制了与电场相关的系统位移，如AC斯塔克位移和黑体辐射。这项工作的一个关键工具是一个稳定的光学本地振荡器，它参考了一个单独的光学时钟。为了证明该系统的前景，该团队将把泛音转换频率的不确定性降低几个数量级，并在一年的时间内对其进行监测。该奖项反映了美国国家科学基金会的法定使命，并通过使用基金会的知识价值和更广泛的影响审查标准进行评估，被认为值得支持。