In this paper, simple consideration of use in everyday quantum chemistry are reviewed. They stress the fact that the 'classical' concepts of total energy and of bond lengths in molecules are based on severe approximation and are not as such accessible to direct experimentation, due to Heisenberg's uncertainty principle and to its main consequence in molecules: the existence of a residual zero point vibration. In this paper, we address successively (a) the determination of total energies, and (b) the meaning of an 'equilibrium' bond length.
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