By using the complete active space self consistent field (CASSCF) with multi-reference configuration interaction MRCI+Q method including single and double excitations with Davidson correction, the 26, 27 and 25 low-lying doublet and quartet electronic states in the representation 2s+1 Λ (+/−) (without spin orbit interaction) of the molecules BeH, MgH and SrH have been investigated. The potential energy curves, the internuclear distance R e , the harmonic frequency ω e , the permanent dipole moment μ, the rotational constant B e and the electronic transition energy with respect to the ground state T e are calculated. Using the canonical approach the eigenvalue E v , the rotational constant B v and the abscissas of the turning points R min and R max have been calculated for the investigated electronic states. The comparison between the values of the present work and those available in the literature for several electronic states shows very good agreement.

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