is greater than the sum of the values of
for a hydrogen and a helium atom
; comp. Part II. [p. 39]), the configuration in question cannot, as will be shown in the next section, be considered to represent a possible molecule of hydrogen and helium.
The vibration of the system corresponding to a displacement of the nuclei relative to each other shows features different from the system considered above of two nuclei of charge
and two electrons. If, for example, the distance between the nuclei is increased, the ring of electrons will approach the nucleus of charge
