Enhancement of molecular ions in mass spectrometry using an ultrashort optical pulse in multiphoton ionization.
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.
Shimizu
Takashi
T
Department of Applied Chemistry, Graduate School of Engineering, Kyushu University, 744, Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
Watanabe-Ezoe
Yuka
Y
Yamaguchi
Satoshi
S
Tsukatani
Hiroko
H
Imasaka
Tomoko
T
Zaitsu
Shin-Ichi
S
Uchimura
Tomohiro
T
Imasaka
Totaro
T
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*
D005456:Fluorescent Dyes; D007477:Ions