The 7500 to 4500 Å absorption system of the free HCO radical

Abstract

The calculation of molecular energies from assumed approximate wave functions is discussed. It is shown that the conventional method, based on the Hamiltonian integral, is but one of several possible approximations, and that two other methods, the virial method and the electrostatic method, avoid the most serious difficulties encountered in a conventional calculation. The mathematical simplicity of the new methods makes them especially suitable for non-empirical calculations on complex systems. The electrostatic method is exemplified by detailed calculations on various electronic states of the hydrogen molecule and the hydrogen molecular ion.