title: Electronic structure of the calcium monohydroxide radical.
abstract: Effective valence shell Hamiltonian H(v) calculations are used to map out three-dimensional potential energy surfaces for the 12 lowest electronic states of the CaOH radical. Excitation energies and spectroscopic constants are compared with experiment and prior computations where available, but many previously unavailable data are provided, including excited state dipole moments and oscillator strengths. Particular attention is paid to clarify the nature of nonlinear and quasilinear excited states, Renner-Teller couplings, and state mixings. The F (2)Pi and G (2)Pi (6 (2)A(') and 8 (2)A(')) states are both found to possess nonlinear local minima, due to an avoided crossing. Attention is also focused on the characteristics of basis sets necessary in high-accuracy calculations for the CaOH radical.
authors.affiliation: James Franck Institute and Department of Chemistry, The University of Chicago, Chicago, IL 60637, USA. cmtaylor@kff1.uchicago.edu
authors.forename: Caroline M
authors.initials: CM
authors.lastname: Taylor
authors.forename: Rajat K
authors.initials: RK
authors.lastname: Chaudhuri
authors.forename: Karl F
authors.initials: KF
authors.lastname: Freed