Ultraviolet Absorption Spectrum of the CaH Molecule II. The structure of the d-complex around 2 850 Å

Abstract

The absorption bands of CaH at 2 883 and 2 852 Å have together with a new band at 2 821 Å been interpreted as a transition from a d -complex to the ground state X 2 Σ + . A Hamiltonian matrix has been constructed for the three upper states G 2 Σ + , J 2 Π and M 2 Δ and the constants for the deperturbed states have been evaluated. The constants reproduce the observed term values within 0.2 cm -1 . The ionisation potential of CaH is estimated to 47 250 ± 750 cm -1 .