Issue |
EPL
Volume 96, Number 2, October 2011
|
|
---|---|---|
Article Number | 23001 | |
Number of page(s) | 4 | |
Section | Atomic, Molecular and Optical Physics | |
DOI | https://doi.org/10.1209/0295-5075/96/23001 | |
Published online | 27 September 2011 |
An accurate and compact wave function for the 4He dimer
Dipartimento di Scienze Chimiche e Ambientali, Università dell'Insubria - Via Lucini 3, I-22100 Como, Italy, EU
a
dario.bressanini@uninsubria.it
Received:
11
July
2011
Accepted:
25
August
2011
We introduce a local measure of the quality of a trial wave function: the local variance. Using this tool we examine the pair function often adopted to construct wave functions for small helium clusters and apply it to a wave function for 4He2 using the TTY interaction potential. Our analysis shows that this commonly employed functional form should be improved in the short-range region. We introduce a new model based on the short-range behaviour of the exact ground-state solution of a Morse potential. The resulting compact trial wave function for 4He2 recovers 98% of the exact binding energy with only six variational parameters.
PACS: 36.40.-c – Atomic and molecular clusters / 31.15.xt – Variational techniques
© EPLA, 2011
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