What is hartree to ev?

Hartree is a unit of energy commonly used in quantum mechanics and atomic physics. It is equal to 27.2114 electron volts (eV). This conversion factor is important because it allows us to compare the energy of electrons in atoms and molecules to the energy of photons (light). For example, the energy of a photon with a wavelength of 500 nm is approximately 2.48 eV, which is equivalent to 0.091 Hartrees. Similarly, the ionization energy of Hydrogen is -13.6057 eV, which is equivalent to -0.5 Hartrees. In general, one Hartree is equivalent to the energy required to ionize one electron from a hydrogen atom.