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首页> 外文会议>Conference on Time and Frequency Metrology >High-precision spectroscopy of antiprotonic helium atoms using femtosecond frequency comb, and related topics in low-energy antiproton physics
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High-precision spectroscopy of antiprotonic helium atoms using femtosecond frequency comb, and related topics in low-energy antiproton physics

机译：使用飞秒频率梳理的防脱位氦原子高精度光谱，以及低能量反罗素物理学的相关主题

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Antiprotonic helium is a unique atomic three-body system which is a mixture of particles and an antiparticle and yet shows metastability with lifetimes of a few microseconds before annihilation of the constituent antiproton. Using the antiprotons provided from the Antiproton Decelerator facility at CERN, Geneva, we the ASACUSA collaboration (standing for Atomic Spectroscopy And Collisions Using Slow Antiprotons) has been pursuing high precision in laser spectroscopy of this exotic atom, to test CPT invariance between matter and antimatter. Recently, we have measured 12 different transition frequencies with fractional precisions in the order of a ppb. A femtosecond optical frequency comb has found application here in measurement of absolute frequencies of a continuous-wave pulse-amplified laser light ranging from blue to infrared. Comparison with three-body QED calculations yielded an antiproton-to-electron mass ratio and antiproton-to-proton mass ratio with a precision of a few ppb, contributing to the precise determination of the fundamental constant and to the test of CPT. As a pioneering work of atomic physics with low-energy antiprotons, we have developed techniques of electromagnetic trapping of antiprotons in ultra-high vacuum and produced ultra-slow antiproton beams at energies ranging from 10 eV to 20 keV. (Note the great orders of magnitude of deceleration and cooling from the GeV energies at which antiprotons are produced at accelerator facilities.) This unique beam is used for our research on atomic collision dynamics between an antiproton and an ordinary atom, and also for future production and microwave spectroscopy of cold antihydrogen atoms.
机译：防辐射氦是一种独特的原子三体系，其是颗粒和抗颗粒的混合物，但在湮灭组分抗滴水之前，寿命具有几微秒的寿命。使用在日内瓦的CERN的Antiproton Decelerator设施中提供的Antiprotons，我们的Asacusa协作（站立用于使用慢反拨功能的原子光谱和碰撞）已经在这种外来原子的激光光谱中追求高精度，以测试物质和反物质之间的CPT不变性。最近，我们已经以PPB的顺序测量了12种不同的过渡频率，具有分数尺寸。在这里发现了一种飞秒光学频率梳在此处的应用在从蓝色到红外线的连续波脉冲扩增的激光光的绝对频率测量。与三体QED计算的比较产生了反阳孔到电子质量比和反阳孔至质子质量比，具有少量PPB的精度，有助于精确测定基本常数和CPT测试。作为用低能量反核官的原子物理的开创性工作，我们已经开发了超高真空中的防滴电池的电磁俘获技术，并在10eV的能量下产生超慢的反罗朗梁，从10eV到20 keV。 （请注意，在加速器设施中产生的GEV精能的减速和冷却的大量次数。）这种独特的光束用于我们对普通原子和普通原子之间的原子碰撞动态的研究，也用于未来的生产和冷抗氢原子的微波光谱。

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