These are input files for a single helium atom.

Directories:

* gamess/[README.md](gamess/README.md)  
* qmcpack/[README.md](qmcpack/README.md)  

These are input files for a single helium atom.


Directories:

* gamess/[README.md](gamess/README.md)  
* qmcpack/[README.md](qmcpack/README.md)  

For reference

* The Hartree-Fock (infinite basis set limit) energy is -2.86168 Hartree [1].
* The exact (non-relativistic) energy is -2.90372 Hartree [2].

[1] [The Electronic Structure of Atoms](http://www2.chem.umd.edu/groups/alexander/teaching/Electronic_structure_atoms.pdf) lecture notes

[2] [High Precision Hy-CI Variational Calculations for the Ground State of Neutral Helium and Heliumlike ions](http://math.nist.gov/mcsd/savg/papers/hehy_ci.ps.gz)

[3] [Ground-State Energy Calculation of Helium Atom Using Quantum Monte Carlo CASINO-Code](http://www.iiste.org/Journals/index.php/APTA/article/download/24612/25214)

Add some energies for the He atom
Add some energies for the He atom