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Magnetometry using Ramsey interferometry in a Yb atomic beam

机译:在Yb原子束中使用Ramsey干涉测量法进行的磁力测量

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We use the Ramsey separated oscillatory fields technique in a 400 degrees C thermal beam of ytterbium (Yb) atoms to measure the Larmor precession frequency (and hence the magnetic field) with high precision. For the experiment, we use the strongly allowed S-1(0) P-1(1) transition at 399 nm, and choose the odd isotope Yb-171 with nuclear spin I = 1/2, so that the ground state has only two magnetic sublevels m(F) = +/- 1/2. With a magnetic field of 22.2 G and a separation of about 400 mm between the oscillatory fields, the central Ramsey fringe is at 16.64 kHz and has a width of 350 Hz. The technique can be readily adapted to a cold atomic beam, which is expected to give more than an order-of-magnitude improvement in precision. The signal-to-noise ratio is comparable to other techniques of magnetometry; therefore it should be useful for all kinds of precision measurements such as searching for a permanent electric dipole moment in atoms.
机译:我们在the(Yb)原子的400摄氏度热束中使用拉姆齐分离振荡场技术,以高精度测量拉莫尔进动频率(从而测量磁场)。对于实验,我们使用在399 nm处强烈允许的S-1(0)P-1(1)跃迁,并选择核自旋I = 1/2的奇同位素Yb-171,因此基态仅具有两个磁子级m(F)= +/- 1/2。在22.2 G的磁场和两个振荡场之间约有400 mm的间距的情况下,中心的Ramsey条纹的频率为16.64 kHz,宽度为350 Hz。该技术可以很容易地适应于冷原子束,这有望在精度上带来超过数量级的改善。信噪比可与其他磁力计技术相提并论。因此,它对于各种精密测量,例如寻找原子中的永久性电偶极矩,都应该是有用的。

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