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Resonant and non-resonant femtosecond ionization mass spectrometry of organochlorine pesticides

Abstract

Thirteen organochlorine pesticides in a standard sample mixture were measured by gas chromatography combined with mass spectrometry using an ultraviolet femtosecond laser (267 nm) as the ionization source, and the observed mass spectra were compared with the corresponding spectra obtained using an electron ionization source. When an ultrashort optical pulse was used for ionization, molecular ions were typically produced which was preferential for reliably identifying the analytes. The ionization mechanism was studied based on three models constructed for resonance-enhanced two-photon ionization, non-resonant two-photon ionization, and non-resonant three-photon ionization. The optimal conditions for observing a molecular ion were investigated using data obtained for three pulse widths. The results suggest that two-photon ionization with minimum excess energy would be optimal for observing a molecular ion.

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Publication details

The article was received on 20 Sep 2019, accepted on 20 Nov 2019 and first published on 22 Nov 2019


Article type: Paper
DOI: 10.1039/C9AN01861A
Analyst, 2019, Accepted Manuscript

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    Resonant and non-resonant femtosecond ionization mass spectrometry of organochlorine pesticides

    S. L. Madunil, T. Imasaka and T. Imasaka, Analyst, 2019, Accepted Manuscript , DOI: 10.1039/C9AN01861A

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