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Stark Shifting and Double Resonance Decomposition in IR MPD Pump‐and‐Probe Experiments
Author(s) -
Rayner D. M.,
Hackett P. A.
Publication year - 1984
Publication title -
israel journal of chemistry
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.908
H-Index - 54
eISSN - 1869-5868
pISSN - 0021-2148
DOI - 10.1002/ijch.198400040
Subject(s) - chemistry , excited state , stark effect , dissociation (chemistry) , resonance enhanced multiphoton ionization , ionization , atomic physics , resonance (particle physics) , ground state , infrared , excited electronic state , laser , spectral line , photoionization , ion , optics , physics , organic chemistry , astronomy
We report upon the dynamics of the IR MPD of perfluoroalkyl iodides using visible laser induced multiphoton ionization of free iodine atoms in their ground state ( 2 P 3/2 ) as the probe technique. Stark shifting of an atomic MPI line by an intense infrared field was observed for the first time. The importance of an IR/visible double resonance dissociation through an excited electronic state was demonstrated and monitored through MPI of the excited spin‐orbit state ( 2 P 1/2 ) which is produced uniquely through this pathway. The consequences of the complications caused by these two effects for pump‐and‐probe experiments are discussed and methods to minimise their effect are suggested.