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

Siddihalu Lakshitha Madunil, Totaro Imasaka, Tomoko Imasaka

    Research output: Contribution to journalArticlepeer-review

    10 Citations (Scopus)


    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.

    Original languageEnglish
    Pages (from-to)777-783
    Number of pages7
    Issue number3
    Publication statusPublished - Feb 7 2020

    All Science Journal Classification (ASJC) codes

    • Analytical Chemistry
    • Biochemistry
    • Environmental Chemistry
    • Spectroscopy
    • Electrochemistry


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