Journal
CHEMPHYSCHEM
Volume 13, Issue 18, Pages 4218-4223Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cphc.201200614
Keywords
circular dichroism; laser mass spectrometry; laser spectroscopy; molecular ions; resonance enhanced multiphoton ionization
Funding
- Deutsche Forschungs Gemeinschaft (DFG)
- European Research Council (ERC)
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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.
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