title: Enhancement of molecular ions in mass spectrometry using an ultrashort optical pulse in multiphoton ionization.
abstract: The spectral domain of an ultraviolet femtosecond laser was expanded by stimulated Raman scattering/four-wave Raman mixing, and the resulting laser pulse was compressed using a pair of gratings. The pulse width was then measured using an autocorrelator comprised of a Michelson interferometer equipped with a multiphoton ionization/mass spectrometer which was used as a two-photon detector. A gas chromatograph/mass spectrometer was employed to analyze triacetone triperoxide (TATP), and the molecular ion induced by multiphoton ionization was substantially enhanced by decreasing the laser pulse width.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744, Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
authors.forename: Takashi
authors.initials: T
authors.lastname: Shimizu
authors.forename: Yuka
authors.initials: Y
authors.lastname: Watanabe-Ezoe
authors.forename: Satoshi
authors.initials: S
authors.lastname: Yamaguchi
authors.forename: Hiroko
authors.initials: H
authors.lastname: Tsukatani
authors.forename: Tomoko
authors.initials: T
authors.lastname: Imasaka
authors.forename: Shin-Ichi
authors.initials: S
authors.lastname: Zaitsu
authors.forename: Tomohiro
authors.initials: T
authors.lastname: Uchimura
authors.forename: Totaro
authors.initials: T
authors.lastname: Imasaka
mesh_terms: D002853:Chromatography, Liquid; D005456:Fluorescent Dyes / Q000737:chemistry; D007477:Ions / Q000737:chemistry*; D013058:Mass Spectrometry / Q000379:methods*; D044085:Microfluidics; D036103:Nanotechnology; D055095:Optics and Photonics / Q000379:methods*
chemical_list: D005456:Fluorescent Dyes; D007477:Ions