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Optics and Spectroscopy

Polarization phenomena upon stepwise excitation

A. G. Petrashen

Published Jun 1, 2013• 0 citations
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Abstract

Although polarization-signal vanishing and the formation of “dark states” is impossible upon stepwise excitation of levels with angular momentum j = 1, it is shown that the dependence of the polarization signal on time permits one to assess the character of coherence between lower levels.
DOI
10.1134/s0030400x13050123

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The 6s2S126s^{2}S_{\frac{1}{2}}6s2S21​​ ground ionic state of even isotopes of mercury was polarized in a stepwise excitation process from the atomic $6{s}^{2}^{1}S_{0}$ ground state via the metastable 6s6p3P26s6p^{3}P_{2}6s6p3P2​ state. The latter was optically pumped with polarized 5461-\AA{} ($6s7s^{3}S_{1}\ensuremath{-}^{3}P_{2}$) radiation. Paramagnetic resonance, observed by monitoring the change in intensity of the relatively intense 2851-\AA{} ($5{d}^{9}6{s}^{2}^{2}D_{\frac{5}{2}}\ensuremath{-}5{d}^{10}6s^{2}S_{\frac{1}{2}}$) electric quadrupole resonance radiation, was used to determine the polarization of the even-isotope ground-state ion to be 15%. If one assumes conservation of spin angular momentum, this process should yield highly polarized electrons.