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The flux of molecules that evaporate from a free surface of gallium nitride in vacuo and the corresponding force imposed on the surface were independently measured by the Langmuir and torsion–Langmuir methods. Comparison of the results shows that the kinetic energy of the escaping vapor molecules is that expected for equilibrium with the surface. For gallium nitride, therefore, it is proved that vapor molecules that evaporate by crossing an energy barrier higher than the equilibrium energy of sublimation are not at a higher average temperature than the surface from which they evaporate.

Kinetic Energy of Molecules That Traverse an Excess-Energy Barrier During Sublimation