Statistical Mechanics

antisymmetric approximation assumed atoms average axis calculated cell center of mass Chapter chemical potential classical classical mechanics cluster coefficient collisions composed condition configuration conjugate momentum constant corresponding crystal cules defined degrees of freedom density depend derived determined diatomic molecule distribution eigenfunctions electrons entropy equal equation equilibrium expression free energy frequency gases given Hamiltonian identical identical particles independent inhibition integral isotopes kinetic energy lattice logarithm magnitude mean free path metal method mole moment of inertia momenta momentum motion N₁ nuclear spin number of molecules number of particles number of quantum obtained partition function perfect gas phase space positive potential energy pressure probability quantity quantum numbers quantum-mechanical range region respect rotational statistical mechanics symmetrical temperature tion total energy total number unity v₂ variable velocity vibration zero