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Two-electron properties for the beryllium atom from explicitly correlated wavefunctions

✍ Scribed by F.J Gálvez; E Buendı́a; A Sarsa

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
200 KB
Volume
378
Category
Article
ISSN
0009-2614

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✦ Synopsis

Two-body properties of the ground state of beryllium atom in position and momentum spaces are obtained starting from a compact and accurate explicitly correlated wavefunction. The wavefunction is factorized into a correlation factor, depending on the interelectronic distance, and a multi configuration expansion. The variational Monte-Carlo method (VMC) has been used to optimize the trial wavefunction and to compute the different properties. The results are compared with others calculated from large configuration interaction expansions, multi configuration self-consistent field wavefunctions and explicitly correlated gaussian expansions, showing good performance of the results of this work. The use of explicitly correlated wavefunction along with the VMC provides reliable results for complex atomic systems as the beryllium atom.

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