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The least-squares method for bound states: a re-examination

โœ Scribed by Kamal Bhattacharyya; Sankar Prasad Bhattacharyya

Publisher
Elsevier Science
Year
1986
Tongue
English
Weight
434 KB
Volume
132
Category
Article
ISSN
0009-2614

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โœฆ Synopsis

The performance of the least-squares method is compared with that of the usual (Rayleigh-Ritz) variation method (UVM) in a specific bound-state calculation. Their relative merits and demerits are carefully analysed with respect to the approximate calculation of expectation vafues of particular types of observables.

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New applications of the least-squares method: Unbound states of helium and asymptotically correct bound states
โœ F.H. Read ๐Ÿ“‚ Article ๐Ÿ“… 1972 ๐Ÿ› Elsevier Science ๐ŸŒ English โš– 369 KB

Two new applkations of the least-squares method are desuibed, namely (i) in the ca!cuIation of the energies and wavefunctions of the unbound 2sz \*S and 2p \* 'S s'ates of He, and (ii) in the -use (for the 2'S, 3'S and 4LS states of He) of basis set functions which are asymptotically correct to a hi