Temperature determination of (CF3I) N clusters in a beam by time-of-flight measurements of IR-laser excited SF6 molecules sublimating from the surface of clusters

摘要

The method is described and the experimental results are presented on the temperature determination of the (CF_3I) _N clusters in a beam (N 10~2 is a number of monomers in a cluster) using SF _6 molecules from intersecting molecular beam as probe thermometers. The SF6 molecules are captured by clusters in the crossed cluster and molecular beams and, after a certain time, sublimate from the surface of clusters carrying information on the velocity and temperature (internal energy) of clusters. Using time-of-flight (TOF) method the kinetic energy (velocity) of sublimated SF6 molecules was measured and the temperature of clusters was determined to be T _(cl) = (88 ± 15) K.