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首页> 外文会议>Time and Frequency Metrology; Proceedings of SPIE-The International Society for Optical Engineering; vol.6673 >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：飞秒频率梳对反质子氦原子的高精度光谱学以及低能反质子物理学中的相关主题

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摘要

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：反质子氦是一个独特的原子三体系统，它是粒子和反粒子的混合物，并且在meta灭组成反质子之前的寿命为几微秒，显示出亚稳态。我们与ASACUSA的合作（使用慢反质子的原子光谱和碰撞技术的代表）使用日内瓦CERN的Antiproton Decelerator设施提供的反质子，一直在追求该异质原子激光光谱的高精度，以测试物质与反物质之间的CPT不变性。 。最近，我们以ppb的量级精度测量了12种不同的跃迁频率。飞秒光学频率梳已经在这里应用于测量从蓝色到红外的连续波脉冲放大激光的绝对频率。与三体QED计算的比较得出反质子与电子的质量比和反质子与质子的质量比，精确度为ppb，有助于精确确定基本常数和进行CPT测试。作为具有低能量反质子的原子物理学的开创性工作，我们开发了在超高真空下电磁俘获反质子的技术，并产生了能量在10 eV至20 keV范围内的超慢反质子束。 （请注意，在加速器设施处产生反质子的GeV能量会产生大量的减速和冷却。）这种独特的光束用于我们研究反质子与普通原子之间的原子碰撞动力学，并用于将来的生产和微波光谱分析冷的氢原子。

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