| Popis: |
The $^{7}P$ terms of two excited chromium configurations have been studied by the techniques of level-crossing and double-resonance spectroscopy. The lifetimes of the $J$ levels of the two terms were found by observation of the Hanle effect to be (3.34\ifmmode\pm\else\textpm\fi{}0.5) \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}8}$ sec and (6.51\ifmmode\pm\else\textpm\fi{}0.9) \ifmmode\times\else\texttimes\fi{} ${10}^{\ensuremath{-}9}$ sec for $(3{d}^{5}4p)^{7}P_{4}$ and $(3{d}^{4}4s4p)^{7}P_{4}$, respectively. ${g}_{J}$ values for the three $J$ levels of the $(3{d}^{5}4p)^{7}P$ term were also determined: $g(J=4)=1.7512(3)$, $g(J=3)=1.9178(2)$, and $g(J=2)=2.3351(3)$. For the purpose of studying core polarization in chromium, measurements were made of the magnetic hyperfine constants in both configurations. For $3{d}^{5}4p$, $|a(J=4)|=11.6\ifmmode\pm\else\textpm\fi{}0.15$ Mc/sec, $|a(J=3)|\ensuremath{\le}1.5\ifmmode\pm\else\textpm\fi{}2.0$ Mc/sec, $|a(J=2)|=26.16\ifmmode\pm\else\textpm\fi{}0.10$ Mc/sec, and for $3{d}^{4}4s4p$, $|a(J=3)|=70.4\ifmmode\pm\else\textpm\fi{}2.6$ Mc/sec. |
