Multiphoton photoelectron spectroscopy: watching molecules dissociate
Literature Information
Bernhard Urban, Vladimir E. Bondybey
Threshold photoionization spectroscopy [zero kinetic energy (ZEKE), pulsed field ionization (PFI), mass analysed threshold ionisation (MATI)] usually takes advantage of multip hoton excitation through bound intermediate states, but we show that excellent quality, high-resolution spectra can also be obtained in one-color experiments using two- and three-photon ionization. An enhancement similar to resonance Raman yields changed spectra if the excitation proceeds ia continuous intermediate states. A molecule which after absorbing a photon started to dissociate is stabilized on the ionic surface by a delayed second photon, with the observed spectra reflecting geometry changes due to this arrested dissociation process. Using two colors, the technique should be applicable to almost any molecule, and yield a detailed insight into its dissociation dynamics.
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