/sci/ - Science & Math

>>11211437
exactly!
Also, the unit of energy is simple. Consider the energies of a hydrogen like atom
[eqn]E_n=-\frac{e^2}{4\pi\varepsilon_0}\cdot\frac{Z^2}{2a_0n^2} =-\frac{1}{2}\cdot\frac{Z^2}{n^2}\text{, since}\\
a_0 =\frac{4\pi\varepsilon_0\hbar^2}{m_ee^2}=1[/eqn]
For this reason this unit system is called "atomic units".
>>11211070
That choice is specifically used in molecular physics as it produces natural scales for atomic and molecular processes (see above). The general Hamiltonian for a molecule becomes trivial, as all precators become one or an integer (charges of nuclei and electrons).