Generation of a Nearly Monocycle Optical Pulse in the Near-Infrared Region and Its Use as an Ionization Source in Mass Spectrometry

Yuta Nakano, Tomoko Imasaka, Totaro Imasaka

    Research output: Contribution to journalArticlepeer-review

    5 Citations (Scopus)

    Abstract

    We report on the generation of an octave-spanning (600-1400 nm) nearly monocycle (1.1 cycle) ultrashort optical pulse (3.2 fs) in the near-infrared region by the Fourier synthesis of two pulses at 800 and 1200 nm, both of which were spectrally broadened by self-phase modulation and were compressed by chirp mirrors. The 3.2 fs pulse was converted into the ultraviolet by third harmonic generation, the pulse width being evaluated to 1.9 fs. The near-infrared pulse (3.2 fs) was employed as an ionization source in mass spectrometry, and the signal intensity was significantly increased for pentachlorobenzene, an environmental pollutant listed in the Stockholm Convention. The present data and the spectral properties obtained by quantum chemical calculations suggest that the method offers a potential advantage for the detection of Novichok, a chemical warfare agent that is thought to have been used in a terrorist attack.

    Original languageEnglish
    Pages (from-to)7130-7138
    Number of pages9
    JournalAnalytical chemistry
    Volume92
    Issue number10
    DOIs
    Publication statusPublished - May 19 2020

    All Science Journal Classification (ASJC) codes

    • Analytical Chemistry

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