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Title: Relativistic coupled-cluster-based linear response theory for ionization potentials of alkali-metal and alkaline-earth-metal atoms
Authors: Chaudhuri, R. K
Panda, P. K
Das, B. P
Mahapatra, U. S
Mukherjee, D
Keywords: Potentials of alkali-metal;Alkaline-earth-metal atoms
Issue Date: Jul-1999
Publisher: The American Physical Society
Citation: Physical Review A, Vol. 60, No.1, pp. 246 - 252
Abstract: We have developed and applied the relativistic coupled-cluster-based linear response theory (RCCLRT) for computing the principal as well as the shake-up ionization potentials (IP's) of Li, Be, Na, and Mg where the single-particle orbitals are generated by solving the relativistic Hartree-Fock-Roothaan equations using the Gaussian basis functions on a grid. The computed principal and shake-up ionization energies by the RCCLRT approach are in favorable agreement with the experimental results. Since for the (one-valence) IP problem, there is a formal equivalence between the principal IP values as obtained from the CCLRT and those obtained as eigenvalues of the multireference coupled-cluster theory, the computed quantities are fully size extensive. The approach via the RCCLRT has the additional advantage of providing the shake-up IP's as well. These are, however, not fully size extensive, but the error scales as the number of valence excitations (2h-1p), so the inextensivity error is rather small.
Appears in Collections:IIAP Publications

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