Abstract
AbstractA description is given of the absorption spectrum in the region between 6000 and 1700 Å of the BeH and BeD molecules obtained in a King furnace. The A2Π ‐ X2Σ+ bands near 5000 Å, observed previously in emission, have been obtained at high resolution in absorption and reanalysed. Improved vibrational and rotational constants are given. Pure electronic energy differences (EΠ ‐ EΣ)BeH = 20 033.19 and (EΠ‐EΣ)BeD = 20 036.11 cm−1 have been derived and show the existence of an electronic isotope shift Δ νe(BeH ‐ BeD) = ‐2.9 ± 1.0 cm−1 which cannot sofar be explained by existing theories. Precise A‐doubling constants of the A2Π sate are also derived.
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