Time-dependent fragment distributions detected via pump-probe ionisation: a theoretical approach |
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Authors: | J Degert C Meier B Girard MJJ Vrakking |
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Institution: | (1) Laboratoire de Collisions, Agrégats et Reactivité, IRSAMC, Université Paul Sabatier, 31062 Toulouse, France, FR;(2) FOM Institute for Atomic and Molecular Physics AMOLF, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands, NL |
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Abstract: | We show how in molecular predissociation a method combining ultrafast pump-probe techniques with a measurement of the relative
recoil velocity can map time-dependent neutral fragment distributions into the ionic continuum. With an appropriate probe
pulse exciting a resonant transition (such as (1+1) Resonance Enhanced Multiphoton Ionisation, or excitation of ZEKE states),
the temporal evolution of fragment distributions can in principle be measured. Numerical simulations on NaI predissociation
are compared to a simple approximate mapping interpretation. The results are discussed in terms of the interplay between temporal
and energetic resolution with respect to current experimental limitations.
Received 13 October 2000 and Received in final form 8 December 2000 |
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Keywords: | PACS 33 80 Gj Diffuse spectra predissociation photodissociation – 03 75 Dg Atom and neutron interferometry – 82 53 Eb Pump probe studies of photodissociation |
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