High-precision measurement and ab initio calculation of the (6s26p2) 3P0→3P2 electric-quadrupole-transition amplitude in Pb208
| Autor: | Marianna Safronova, Daniel Maser, Sergey G. Porsev, Eli Hoenig, P. K. Majumder, Bingyi Wang, P. M. Rupasinghe |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Physical Review A. 100 |
| ISSN: | 2469-9934 2469-9926 |
| DOI: | 10.1103/physreva.100.052506 |
| Popis: | We have completed a measurement of the $(6{s}^{2}6{p}^{2})\phantom{\rule{0.16em}{0ex}}^{3}P_{0}\ensuremath{\rightarrow}^{3}P_{2}$ 939 nm electric quadrupole ($E2$) 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 $\ensuremath{\langle}^{3}P_{2}||Q||^{3}P_{0}\ensuremath{\rangle}=8.91(9)$ a.u. We also present an ab initio theoretical calculation of this matrix 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 $^{208}\mathrm{Pb}$ to between 800 and $940{\phantom{\rule{0.16em}{0ex}}}^{\ensuremath{\circ}}\mathrm{C}$, apply a $\ensuremath{\sim}10\phantom{\rule{4pt}{0ex}}\mathrm{G}$ longitudinal magnetic field, and use polarization modulation and lock-in detection to measure optical rotation amplitudes of order 1 mrad with noise near $1\phantom{\rule{4pt}{0ex}}\ensuremath{\mu}\mathrm{rad}$. We compare the Faraday rotation amplitude of the $E2$ transition to that of the $^{3}P_{0}\ensuremath{-}^{3}P_{1}$ 1279 nm magnetic dipole ($M1$) transition under identical sample conditions. |
| Databáze: | OpenAIRE |
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