  We analyze the electronic structure of molecules which may exist in gas phase
of chemical vapor deposition process for GeSbTe alloy using the electronic
stress tensor, with special focus on the chemical bonds between Ge, Sb and Te
atoms. We find that, from the viewpoint of the electronic stress tensor, they
have intermediate properties between alkali metals and hydrocarbon molecules.
We also study the correlation between the bond order which is defined based on
the electronic stress tensor, and energy-related quantities. We find that the
correlation with the bond dissociation energy is not so strong while one with
the force constant is very strong. We interpret these results in terms of the
energy density on the "Lagrange surface", which is considered to define the
boundary surface of atoms in a molecule in the framework of the electronic
stress tensor analysis.
