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  1. Column or fused silica capillary tubing inside 1/16” PEEK tubing that is covered in heat tape and insulation Column or ArSLID fused silica capillary tubing Nitrogen Beam Copper (10 cm focal length) stop Laser beam (+300 V) (266 nm) + 300 VDC battery Plano-convex lens Loop Laser HP-5 injector H (266 nm) column E RASE system L I Connection to U Varian 3700 GC oven M electrometer HP 3600 Series II Integrator Collector Ceramic electrode base Rapid Measurements Using an Aromatic Specific Laser Ionization Detector (ArSLID)Anthony J. Borgerding1, Gregg Scheiffer1, Melissa J. Meyer2, Orven J. Swenson31University of St. Thomas, Dept. of Chemistry, St. Paul, MN, 2University of North Dakota, Grand Forks, ND; 3North Dakota St. Univ. Fargo, ND • Benefits • Simple, Inexpensive • ~$9K for laser • No vacuum pumps • Simple electrometer for • signal amplfication • Small Size • “Shoebox” laser • < 30 cm laser path • Selective for Aromatics • Sensitive • Aromatic Specific Laser Ionization Detector • What is it? • Atmospheric Pressure REMPI • (Resonance-Enhanced MultiPhoton Ionization) • Ions are focussed onto collector wire • Signal is Amplified and Recorded Detector Cell Instrumental Setup 0 1 20 1 2 Time (min) • Instrumental Details • Laser • Dimensions: • Head: 4 cm x 3 cm x 14 cm • Power supply: 10 cm x 12 cm x 16 cm • 8 kHz • 266 nm • ~4 mJ / pulse • JDS Uniphase (San Jose, CA)