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The damping of hot giant dipole resonances is investigated. The contributionof surface scattering is compared with the contribution from interparticlecollisions. A unified response function is presented which includes surfacedamping as well as collisional damping. The surface damping enters the responsevia the Lyapunov exponent and the collisional damping via the relaxation time.The former is calculated for different shape deformations of quadrupole andoctupole type. The surface as well as the collisional contribution eachreproduce almost the experimental value, therefore we propose a properweighting between both contributions related to their relative occurrence dueto collision frequencies between particles and of particles with the surface.We find that for low and high temperatures the collisional contributiondominates whereas the surface damping is dominant around the temperatures$\sqrt{3}/2\pi$ of the centroid energy.Comment: PRC su

Chaotic scattering on surfaces and collisional damping of collective modes