title: Imaging of polycyclic aromatic hydrocarbons by means of sputtered neutrals mass spectrometry using a diode-pumped solid-state laser.
abstract: Laser post-ionization of sputtered molecules by pulsed Ga focused ion-beam (Ga-FIB) bombardment was examined for the detection and imaging of polycyclic aromatic hydrocarbons (PAHs) on particles. As model samples, pyrene and pelyrene adsorbed on TiO2, blended regents of pyrene and n-heneicosan were used. The TiO2 particle size was selected to be several micro-meters. Laser light and Ga-FIB were synchronized with each other. The repetition rate synchronized with Ga-FIB was 1 kHz for pyrene analysis and 2 kHz for perylene, respectively. The laser wavelength was set to 266 nm. The wavelength was a generated fourth harmonic of a Nd:YAG DPSS (diode-pumped solid-state) micro-chip laser (UV microchip laser). By using a UV microchip laser, laser-SNMS (laser post-ionized sputtered neutral mass spectrometry) analysis and imaging were performed. The imaging of pyrene (m/z = 202, C16H10) and perylene (m/z = 252, C20H12) has been successful. Both the scanning ion microscopy image of TiO2 and the PAHs image in laser-SNMS analysis were well-fitted with each other.
authors.affiliation: Graduate School of Electrical and Electronics Engineering, Kogakuin University, Tokyo, Japan. kt13222@ns.kogakuin.ac.jp
authors.forename: Kenji
authors.initials: K
authors.lastname: Ohishi
authors.forename: Tetsuo
authors.initials: T
authors.lastname: Sakamoto
authors.forename: Jiro
authors.initials: J
authors.lastname: Saikawa
authors.forename: Naoya
authors.initials: N
authors.lastname: Ishigaki
authors.forename: Koji
authors.initials: K
authors.lastname: Tojo
authors.forename: Yutaka
authors.initials: Y
authors.lastname: Ido
authors.forename: Shun-ichi
authors.initials: S
authors.lastname: Hayashi
authors.forename: Shun-ichi
authors.initials: S
authors.lastname: Ishiuchi
authors.forename: Kentaro
authors.initials: K
authors.lastname: Misawa
authors.forename: Masaaki
authors.initials: M
authors.lastname: Fujii