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Laser spectroscopy of molecules

分子激光光谱

基本信息

批准号：
14045219
负责人：
Professor Stephan Schiller, Ph.D.
金额：
--
依托单位：
Institut für Experimentalphysik
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2005
资助国家：
德国
起止时间：
2004-12-31 至 2011-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/14045219?language=en
关键词：
Laser spectroscopy molecules

项目摘要

We have recently achieved reliable production of molecules with translational temperatures at the millikelvin level. One of the most promising applications for such ultracold molecules is high-resolution laser spectroscopy. In this project we will perform what will be, to our knowledge, the first experiment of this type. In particular, we will demonstrate laser spectroscopy of vibrational transitions in the HD+ molecule, concentrating on an overtone transition at a wavelength of 1.4(m . The HD+ molecule is of fundamental importance because it is one of the simplest molecules, containing just a single electron. Precise measurement of vibrational transition frequencies will ultimately allow (i) to test theoretical methods of precision calculation of molecular levels; (ii) to demonstrate the existence of QED effects in molecules; (iii) to determine the ratio of electron-to-proton mass in a novel way and with potentially higher precision than with alternative methods; (iv) to measure nuclear properties such as quadrupole moments, (v) to test the time-independence of nuclear mass ratios. The two-year goal consists in achieving a spectral resolution at a level of 10-8 such that the gross features of the hyperfine structure can be resolved, and in obtaining an absolute measurement of a few rotational-vibrational transition frequencies with a similar precision. This will be performed by means of a femtosecond frequency comb. An investigation of systematic effects will be performed in order to establish the accuracy. The methods developed in our project will also be applicable to a large variety of other molecular ions.

我们最近已经实现了可靠的生产分子的平移温度在毫开尔文水平。此类超冷分子最有前途的应用之一是高分辨率激光光谱学。在这个项目中，我们将执行什么，据我们所知，这种类型的第一个实验。特别是，我们将展示HD+分子中振动跃迁的激光光谱，集中在波长为1.4（m）的泛音跃迁上。HD ~+分子是最简单的分子之一，只有一个电子，因此它的振动跃迁频率的精确测量将有助于（i）检验精确计算分子能级的理论方法，（ii）证明分子中QED效应的存在，（iii）证明量子电动力学效应的存在。（iii）以一种新的方式确定电子与质子的质量之比，其精确度可能高于其他方法;（iv）测量核的性质，如四极矩;（v）检验核质量比的时间无关性。两年的目标是实现10-8级的光谱分辨率，以便可以分辨超精细结构的总体特征，并以类似的精度获得几个旋转-振动跃迁频率的绝对测量。这将通过飞秒频率梳进行。将进行系统效应的调查，以确定准确度。在我们的项目中开发的方法也将适用于各种各样的其他分子离子。