# EigenEnergies

## 1.Brief description

EigenEnergies are one-electron Hartree–Fock energies $$\varepsilon_p$$ for the states $$p$$. The states $$p$$ must be ordered such that their energies $$\varepsilon_p$$ are non-descending. All objects with indices referring to states $$p$$ must be in the same order.

## 2.Specification

Unlike in other objects, the Fermi energy $$\varepsilon_\mathrm{F}$$ and all energies $$\varepsilon_p$$ must also be listed in the metaData section such that cc4s can determine the number of occupied and virtual states during a dry-run without reading the content file EigenEnergies.elements.

An example EigenEnergies.yaml file is given below

version: 100
type: Tensor
scalarType: Real64
dimensions:
- length:     96
type: State
elements:
type: TextFile
unit: 0.03674932217563878       # = (Eh/eV)