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Abstract
The rotationally resolved absorption spectrum of the 3d $^{2}\mathit{p}$ $^{2}\mathrm{\ensuremath{\Pi}}$ transition in molecular LiHe has been measured. For each of three isotropic variants $^{6}\mathrm{Li}^{3}$He, $^{6}\mathrm{Li}^{4}$He, and $^{7}\mathrm{Li}^{4}$He, six vibrational transitions have been observed from the lower 2p $^{2}\mathrm{\ensuremath{\Pi}}$(v''=0,1) electronic state to the upper 3d $^{2}\mathrm{\ensuremath{\Delta}}$(v'=0,1,2,3) electronic state. Analysis of the observed spectra has yielded values for the well depth and equilibrium separation of 1020(20) ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}1}$ at 3.37(3)${\mathit{a}}_{0}$ for the 2p $^{2}\mathrm{\ensuremath{\Pi}}$ state and 610(20) at 3.52(2)${\mathit{a}}_{0}$ for the 3d $^{2}\mathrm{\ensuremath{\Delta}}$ state. Details of our analysis and our experimental technique are presented.
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