Hyperspherical adiabatic approach for the helium atom
- Instituto de Fisica de Sao Carlos, Universidade de Sao Paulo, Caixa Postal 369, Sao Carlos, Sao Paulo (Brazil)
- Yale University, New Haven, Connecticut 06511 (United States)
The nonadiabatic ground state for the helium atom is obtained with the hyperspherical adiabatic approach. Potential curves, nonadiabatic couplings, and channel functions are calculated by a numerically exact procedure based on the analytical expansion of the channel functions. The coupled radial equations are solved by standard techniques. The convergence of the procedure is investigated as nonadiabatic couplings are systematically introduced. The inclusion of 11 potential curves and channel functions gives a ground-state energy that differs from the best variational calculation by 0.1 parts per million.
- OSTI ID:
- 118463
- Journal Information:
- Physical Review A, Journal Name: Physical Review A Journal Issue: 4 Vol. 52; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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