The temperature dependence of photoabsorption of V-13(+)

Photoabsorption cross sections of trapped V-13(+) clusters were measured fo r energies between 1.4 eV and 6.1 eV by use of a two-photon fragmentation t echnique. Using two laser pulses separated by a 100-ns delay period the cro ss sections of hot clusters (up to 1800 K) could be compared to the values at room temperature. Whereas sodium clusters are known to exhibit pronounce d temperature dependence below 300 K, no continuation of these effects to h igher temperatures was found for V-13(+).