首页|High-precision measurement and ab initio calculation of the (6s~26p~2 ) ~3P_0 →~3P_2 electric-quadrupole-transition amplitude in ~(208)Pb
High-precision measurement and ab initio calculation of the (6s~26p~2 ) ~3P_0 →~3P_2 electric-quadrupole-transition amplitude in ~(208)Pb
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NSTL
Amer Physical Soc
We have completed a measurement of the (6s~26p~2 ) ~3P0 → ~3P_2 939 nm electric quadrupole (E_2) transition amplitude in atomic lead. Using a Faraday rotation spectroscopy technique and a sensitive polarimeter, we have measured this very weak E2 transition, and determined its amplitude to be <~3P_2||Q||~3P_0> = 8.91(9) a.u. We also present an ab initio theoretical calculation of thismatrix element, determining its value to be 8.86(5) a.u., which is in excellent agreement with the experimental result.We heat a quartz vapor cell containing ~(208)Pb to between 800 and 940 ?C, apply a ～10 G longitudinal magnetic field, and use polarization modulation and lock-in detection to measure optical rotation amplitudes of order 1 mrad with noise near 1 μrad. We compare the Faraday rotation amplitude of the E2 transition to that of the ~3P_0-~3P_1 1279 nm magnetic dipole (M1) transition under identical sample conditions.
NSTL
Amer Physical Soc
