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Laser Mass Spectrometry with Circularly Polarized Light: Circular Dichroism of Molecular Ions
Author(s) -
Logé Christoph,
Boesl Ulrich
Publication year - 2012
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201200614
Subject(s) - circular dichroism , chemistry , excited state , ion , ionization , spectroscopy , magnetic circular dichroism , ionic bonding , resonance enhanced multiphoton ionization , mass spectrometry , vibrational circular dichroism , dichroism , linear dichroism , photoionization , resonance (particle physics) , analytical chemistry (journal) , atomic physics , crystallography , optics , spectral line , physics , organic chemistry , astronomy , chromatography , quantum mechanics
In recent experiments of resonance‐enhanced laser ionization, large differences between circular dichroism measured for molecular and fragment ions were found by several research groups for different molecular systems. In the case of 3‐methylcyclopentanone (3‐MCP) we attributed this effect to a large circular dichroism of the molecular ion. In the work presented here, this effect in 3‐MCP is studied by ion spectroscopy, by varying the neutral intermediate excited state involved in resonance‐enhanced multiphoton ionization (REMPI) and by performing REMPI‐induced measurements of circular dichroism at different laser pulse energies. It turns out that the dynamics of structural changes in the ionic ground state strongly influences the observed ionic circular dichroism.