Multiphonon Up-Pumping and Molecular Hot Spots in Superheated Polymers Studied byUltrafast Optical Calorimetry

摘要

Ultrafast temperature jump experiments are performed on polymers doped with smallconcentrations of dyes which function as point sources of phonons (molecular heaters) and thermometers. Internal conversion, multiphonon up-pumping and vibrational cooling of dyes in the polymer, occurring on the 0.1 to 100 ps time scale, are investigated. (Author)