Electron impact excitation of calcium.

We have used the $B$-spline $R$-matrix (close-coupling) method with non-orthogonal sets of orbitals~[1] to extend our recent calculation for low-energy elastic electron collisions with calcium atoms~[2] to excitation of the lowest few excited states. Our results for state-selected angle-integrated and angle-differential cross sections, as well as angle-differential electron-impact correlation parameters, measured in electron-photon coincidence or superelastic scattering setups, will be compared with recent experimental data~[3,4] and predictions from other theoretical methods~[5,6]. \par\vspace{0.1truecm}\noindent [1] O.~Zatsarinny, Comp. Phys. Commun. {\bf 174}, 273 (2006). \par\noindent [2] O.~Zatsarinny {\it et al.}, Phys. Rev. A {\bf 74}, 052708 (2006). \par\noindent [3] S. Milisavljevic {\it et al.}, J. Phys. B {\bf 37}, 3571 (2004). \par\noindent [4] A. Murray and D. Cvejanovic, J. Phys. B {\bf 36}, 4889 (2003). \par\noindent [5] R. Chauhan {\it et al.} J. Phys. B {\bf 38}, 2385 (2005). \par\noindent [6] S. Kawazoe {\it et al.}, J. Phys. B {\bf 39}, 493 (2006).