Study of coupled states for the (4s 2 ) 1 S + (4s4p) 3 P asymptote of Ca2 (original) (raw)

The coupled states A1Σu+ (1D + 1S), c3Πu (3P + 1S) and a3Σu+ (3P + 1S) of the calcium dimer are investigated in a laser induced fluorescence experiment combined with high-resolution Fourier-transform spectroscopy. A coupled state analysis of the observed levels, considering a potential model, which is complete within the subspace of relevant neighboring states, is performed using the Fourier Grid Hamiltonian method. We determine the potential energy curve of the A1Σu+ and c3Πu states and the strengths of the couplings between them. The c3Πu and a3Σu+ states are of particular importance for the description of collisional processes between calcium atoms in the ground state 1S0 and excited state 3P1 applied in studies for establishing an optical frequency standard with Ca.