Abstract
Presents the first detailed theoretical calculation of the absorption spectrum of Sr out of the 5s2 1S0 ground state. The autoionisation region below the 5p3/2 threshold is investigated, photoionisation cross sections being calculated by combining the multichannel quantum defect theory (MQDT) with the eigenchannel R-matrix method. Small-scale variational R-matrix calculations enable one to evaluate LS-coupled short-range reaction matrices. A jj-coupled reaction matrix is then deduced using a geometrical frame transformation. Diagonalisation of this matrix gives the energy-dependent MQDT parameters required for the description of the 13 relevant interacting channels. The 13-channel MQDT model built with theoretical R-matrix parameters provides an accurate description of the positions and the shapes of the 4d3/2,5/2 np, nf and 5p1/2,3/2 ns, nd J=1 autoionising lines. Particular attention is paid to high lying resonances observed near the spin-orbit split 4d3/2,5/2 and 5p1/2,3/2 thresholds.
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More From: Journal of Physics B: Atomic and Molecular Physics
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