Abstract
Two photon ionisation and dissociation of Na2 resonantly enhanced via the (2)1Σu double minimum state has been studied. A pulsed, cold molecular beam, UV-laser excitation and ionisation in the energy range from 28 400 to 29 850 cm−1 and kinetic energy analysis of the fragments by a time of flight method (KETOF) is used. Fast Na+ fragments are formed via intermediates below and above the barrier of the double minimum state while slow fragments are observed predominantly from vibrational states above the barrier. Some indication of tunneling is also seen. The KETOF spectra reveal three groups of kinetic energies. The relative abundance of these fragments depends on the laser polarisation and is different for slow, intermediate and fast fragments. A Monte-Carlo simulation of the KETOF spectra using bound-free Franck-Condon factors gives a satisfactory agreement with the experimental observations and allows a consistent explanation of the observations.
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Haugstätter, R., Goerke, A. & Hertel, I.V. Case studies in multiphoton ionisation and dissociation of Na2 . Z Phys D - Atoms, Molecules and Clusters 9, 153–166 (1988). https://doi.org/10.1007/BF01384267
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DOI: https://doi.org/10.1007/BF01384267