Abstract
TheA1Σ+–X1Σ+band system of BeH+, BeD+, and BeT+has been photographed at high resolution and rotationally analyzed. Together with literature data (W. W. Watson and R.F. Humphreys,Phys. Rev.52,318–321 (1937)) forv″ = 7–10 of BeH+, the data set samples vibrational levels that extend up to ≈2/3 and ≈1/2 of the well depths of theXandAstates, respectively. The measured line positions were employed in a global least-squares fit of the molecular Hamiltonians for the two states that take account of Born–Oppenheimer breakdown effects and in which a modified Lennard–Jones (MLJ) function is employed for the potential energy. The fit reproduces the measurements to within the estimated accuracy (≈0.05 cm−1).
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