Characterization of theI(|Ω|=1)–X1Σ+(0,0)band of thorium oxide

Abstract

The $I(|\ensuremath{\Omega}|=1)\phantom{\rule{1.0pt}{0ex}}--\phantom{\rule{1.0pt}{0ex}}X\phantom{\rule{0.28em}{0ex}}{}^{1}{\ensuremath{\Sigma}}^{+}(0,0)$ band near 512 nm of thorium oxide has been recorded and analyzed field free and in the presence of both static electric and magnetic fields. The determined ${T}_{00}$, $B$, and $q$ field-free parameters for the $I(|\ensuremath{\Omega}|=1)(v=0)$ state are $(\text{in}\phantom{\rule{5.0pt}{0ex}}\mathrm{c}{\mathrm{m}}^{\ensuremath{-}1})19539.3823\ifmmode\pm\else\textpm\fi{}0.0003,0.328 69\ifmmode\pm\else\textpm\fi{}0.000 03$, and 0.001 54 \ifmmode\pm\else\textpm\fi{} 0.000 05. The Zeeman-induced shifts and splittings of the low-$J$ lines were analyzed to determine $g$ factors and suggest that the $I(|\ensuremath{\Omega}|=1)(v=0)$ state has a dominant ${}^{1}\ensuremath{\Pi}$ character. The Stark tuning of the low-$J$ lines was analyzed to determine the permanent electric dipole moment ${\ensuremath{\mu}}_{\mathrm{el}}$ for the $I(|\ensuremath{\Omega}|=1)(v=0)$ state of 4.25 \ifmmode\pm\else\textpm\fi{} 0.02 D.