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Noise Power Spectral Characteristics of an Inductively Coupled Plasma Mass Spectrometer 606
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Discrete frequency noise in ICP/MS is very similar to that seen in emission from upstream of the MS sampling orifice, but different from that from the ICP alone. The data indicate that discrete frequency noise in ICP/MS originates in the ICP. Jeffrey S. Crain, R. S. Houk*, and David E. Eckels, Ames Laboratory—U.S. Department of Energy and Department of Chemistry, Iowa State University, Ames, IA 50011
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Ultraviolet and Infrared Laser Excited Two-Color Multiphoton Ionization for Determination of Molecules in Solution 612
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The additional excitation by the IR pulse improves the detection of aromatic molecules and vitamins by three- to sixfold as compared with the case of the UV pulse alone. Sunao Yamada, Laboratory of Chemistry, College of General Education, Kyushu University, Ropponmatsu, Fukuoka 810, Japan
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Quantitative Analysis of Diazonaphthoquinones by Thin-Layer Chromatographic/Diffuse Reflectance Infrared Fourier Transform Spectrometry 615 Mixtures of photochemically labile compounds are separated by HPTLC and quantitatively analyzed in situ using diffuse reflectance FT-IR spectroscopy. Results for low microgram levels are achieved in Fe >Cu>Cd>Zn>Mn>Mo>Sr>Ni>V>Se>As>Co. Cynthia A. Mahan, Vahid Majidi, and James A. Holcombe*, Department of Chemistry, The University of Texas at Austin, Austin, TX 78712
392 A · ANALYTICAL CHEMISTRY, VOL. 61, NO. 6, MARCH 15, 1989
