A diatomic molecule is made of two masses \displaystyle{m}_{}

and m_

\displaystyle{w}{h}{i}{c}{h}{a}{r}{e}{s}{e}{p}{a}{r}{a}{t}{e}{d}{b}{y}{a}{d}{i}{s}{\tan{{c}}}{e}{r}.{I}{f}{w}{e}{c}{a}{l}{c}\underline{{a}}{t}{e}{i}{t}{s}{r}{o}{t}{a}{t}{i}{o}{n}{a}{l}{e}\ne{r}{g}{y}{b}{y}{a}{p}{p}{l}{y}\in{g}{B}{o}{h}{r}'{s}{r}\underline{{e}}{o}{f}{a}{n}{g}\underline{{a}}{r}{m}{o}{m}{e}{n}{t}{u}{m}{q}{u}{a}{n}{t}{i}{z}{a}{t}{i}{o}{n},{i}{t}{s}{e}\ne{r}{g}{y}{w}{i}{l}{l}{b}{e}{g}{i}{v}{e}{n}{b}{y}{\left({n}{i}{s}{a}{n}\int{e}\ge{r}\right)}