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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分子的可靠生产，其平移温度在毫克尔文水平。这种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，据我们所知，我们将进行这种类型的第一次实验。特别是，我们将演示HD+分子中振动跃迁的激光光谱，集中在1.4(M)波长的泛音跃迁。HD+分子至关重要，因为它是最简单的分子之一，只包含一个电子。对振动跃迁频率的精确测量最终将使：(1)测试精确计算分子能级的理论方法；(2)证明分子中存在QED效应；(3)以一种新的方式确定电子与质子质量之比，并可能比用替代方法更精确；(4)测量核性质，如四极矩；(5)测试核质量比的时间无关性。两年的目标是达到10-8的光谱分辨率，以便能够分辨超精细结构的总体特征，并以类似的精度获得对几个转动-振动跃迁频率的绝对测量。这将通过飞秒频率梳来执行。为了确定准确性，将进行系统影响的调查。我们项目中开发的方法也将适用于许多其他分子离子。