Measurement of the positronium 13S1-23S1 interval by continuous-wave two-photon excitation
Measurement of the positronium 13S1-23S1 interval by continuous-wave two-photon excitation
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连续波双光子激发测量正电子素13S1-23S1区间
DOI：
10.1103/physrevlett.70.1397
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发表时间：
1993
影响因子：
8.6
通讯作者：
D. Zuckerman
中科院分区：
文献类型：
--
作者：
M. Fee;A. Mills;S. Chu;E. D. Shaw;K. Danzmann;R. Chichester;D. Zuckerman
用连续波激发消除了脉冲激光测量非线性跃迁所固有的问题，我们测量了电子偶素（Ps）的1[sup 3][ital S][sub 1-]2[sup 3][ital S][sub 1]间隔为1233607216.4 [+-] 3.2MHz。引用的2.6 ppb（每10[sup 9]的份数）不确定度主要是由于相对于Te[sub 2]参考线的Ps共振的测定，其中1.5 ppb来自最近相对于氢1[ital S]-2[ital S]跃迁的Te[sub 2]线的校准。不确定性对应于[alpha][sup 2][ital R][sub [infinity]] QED对1[sup 3][ital S][sub 1-]2[sup 3][ital S][sub 1]区间的贡献的3.5[乘以]10[sup [minus]5]。我们的测量是足够准确的，以提供一个测试尚未计算的[alpha][sup 4][ital R][sub [infinity]] QED修正。
Using continuous-wave excitation to eliminate the problems inherent with pulsed laser measurements of nonlinear transitions, we have measured the 1[sup 3][ital S][sub 1-]2[sup 3][ital S][sub 1] interval in positronium (Ps) to be 1 233 607 216.4[plus minus]3.2 MHz. The quoted 2.6 ppb (parts per 10[sup 9]) uncertainty is primarily due to the determination of the Ps resonance relative to the Te[sub 2] reference line, with a 1.5 ppb contribution from a recent calibration of the Te[sub 2] line relative to the hydrogen 1[ital S]-2[ital S] transition. The uncertainty corresponds to 3.5[times]10[sup [minus]5] of the [alpha][sup 2][ital R][sub [infinity]] QED contribution to the 1[sup 3][ital S][sub 1-]2[sup 3][ital S][sub 1] interval. Our measurement is sufficiently accurate to provide a test of the as yet uncalculated [alpha][sup 4][ital R][sub [infinity]] QED corrections.