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Journal
2013 | 11 | 2 | 195-205
Article title

Solution to the equations of the moment expansions

Content
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Languages of publication
EN
Abstracts
EN
We develop a formula for matching a Taylor series about the origin and an asymptotic exponential expansion for large values of the coordinate. We test it on the expansion of the generating functions for the moments and connected moments of the Hamiltonian operator. In the former case the formula produces the energies and overlaps for the Rayleigh-Ritz method in the Krylov space. We choose the harmonic oscillator and a strongly anharmonic oscillator as illustrative examples for numerical test. Our results reveal some features of the connected-moments expansion that were overlooked in earlier studies and applications of the approach.
Publisher

Journal
Year
Volume
11
Issue
2
Pages
195-205
Physical description
Dates
published
1 - 2 - 2013
online
9 - 2 - 2013
Contributors
author
  • Facultad de Ciencias, CUICBAS, Universidad de Colima, Bernal Díaz del Castillo 340, Colima, Colima, Mexico, paolo.amore@gmail.com
  • INIFTA (UNLP, CCT La Plata-CONICET), División Química Teórica, Blvd. 113 S/N, Sucursal 4, Casilla de Correo 16, 1900, La Plata, Argentina, fernande@quimica.unlp.edu.ar
References
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.-psjd-doi-10_2478_s11534-012-0154-4
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