Thermal behaviour of metal films - a hyperbolic two-step model

A perturbation technique is proposed for solution of the generalized equati ons governing the thermal behaviour of thin metal films described by a hype rbolic two-step model. The generalized equations of this model contains dif fusion terms in both the electron and lattice energy equations and assumes that incident laser radiation is absorbed by both the electron gas and soli d lattice to account for the thermal behaviour of semiconducting and impure metals. A perturbation technique is utilized to eliminate the coupling bet ween the electron and phonon energy equations when the normalized temperatu re difference between electrons and phonons is a small quantity, which is t rue in materials exhibit high coupling factors.