title: Ultraviolet femtosecond laser ionization mass spectrometry.
abstract: For this study, multiphoton ionization/mass spectrometry using an ultraviolet (UV) femtosecond laser was employed for the trace analysis of organic compounds. Some of the molecules, such as dioxins, contain several chlorine atoms and have short excited-state lifetimes due to a "heavy atom" effect. A UV femtosecond laser is, then, useful for efficient resonance excitation and subsequent ionization. A technique of multiphoton ionization using an extremely short laser pulse (e.g., <10 fs), referred to as "impulsive ionization," may have a potential for use in fragmentation-free ionization, thus providing information on molecular weight in mass spectrometry.
authors.affiliation: Department of Applied Chemistry, Graduate School of Engineering, and Division of Translational Research, Center for Future Chemistry, Kyushu University, 744, Motooka, Nishi-ku, Fukuoka 819-0395, Japan.
authors.forename: Totaro
authors.initials: T
authors.lastname: Imasaka
mesh_terms: D001555:Benzene Derivatives / Q000737:chemistry; D004147:Dioxins / Q000737:chemistry; D007834:Lasers; D008970:Molecular Weight; D009711:Nucleotides / Q000737:chemistry; D010636:Phenols / Q000737:chemistry; D011108:Polymers / Q000737:chemistry; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization / Q000295:instrumentation* / Q000379:methods*; D013997:Time Factors; D014466:Ultraviolet Rays
chemical_list: D001555:Benzene Derivatives; D004147:Dioxins; D009711:Nucleotides; D010636:Phenols; D011108:Polymers