Author/Authors :
Bréchignac، نويسنده , , C. and Cahuzac، نويسنده , , Ph. and Concina، نويسنده , , B. and Leygnier، نويسنده , , J. and Villard، نويسنده , , B. and Parneix، نويسنده , , P. and Bréchignac، نويسنده , , Ph.، نويسنده ,
Abstract :
Time-of-flight mass spectrometry is used to measure the translational kinetic energy release during the unimolecular decay of Nan+ (n=5–21) clusters. The detection of neutral fragments of evaporation allows measurement of translational kinetic energies as small as 10 meV. The kinetic energy release predicted in the frame of a harmonic model is compared with the measured value. The discrepancy, interpreted in the frame of a novel extension of phase-space theory, emphasizes the effect of the sub-cluster rotation in the kinetic energy release and the role of vibrational anharmonicity.
