Spectroscopy - May 2008 - (Page 29)

MAY 2008 SPECTROSCOPY GLOBAL EDITION 29 few seconds. This is very much an applications-driven product for public safety, and an onboard hazard database provides medical response data for those exposed to specific corrosive or toxic materials identified by the instrument. For many years, we have lived with the infrared spectrum ending at the far infrared. For many, that was around 200 cm 1, with both scanning dispersive instruments and FT-IR spectrometers equipped with cesium iodide optics. FT-IR instruments equipped with nontraditional beamsplitters, including silicon optics and Mylar pelicules, have been used to probe lower in the spectrum, and instruments that can be equipped for this range are still offered by companies such as Bruker, Thermo Fisher Scientific, and Bomem. Today, we have another class of instrument that probes the lower reaches of the vibrational (and rotation) spectrum, which is the terahertz spectrometers that cover the range from close to 0 cm 1 to 100 cm 1 (as low as 0.02 THz to 3 THz). Two companies visited at Pittcon with product offerings in this range were TeraView (Cambridge, United Kingdom) and Picometrix (Ann Arbor, Michigan). TeraView introduced the Spectra 3000, a spectrometer designed to accept standard ATR and transmission spectrometer accessories. The instrument also offers transmission imaging and standoff explosion detection accessories. The T-Ray 4000 is a time-domain terahertz (TD-THz) system, introduced by Picometrix, which operates in both transmission and reflection modes, with fiber-optic coupled sensor heads for high-speed imaging. It is intended for gas, liquid, and solid spectroscopy, and is ideal for nondestructive materials testing and inspection. Two unique products were offered by BioTools (Jupiter, Florida), the ChiralIR and the BioRaman; the latter being a fast collection Raman spectrometer. The ChiralIR features an integrated FT-IR spectrometer (based on a Bomem bench) configured for vibrational circular dichroism (VCD). VCD in this configuration is defined as the difference, in absorbance, between left and right circularly polarized IR radiation. It combines the structural specificity of FT-IR spectroscopy with the stereo sensitivity of circular dichroism. It can be used for the separation of enantiomeric pairs of chiral molecules. It is an important tool for structural studies of biomolecules and physiologically important molecules. This product complements the ChiralRaman system that was awarded the 2004 R&D 100 award. The BioRaman offers 90% collection efficiency, producing very high quality Raman spectra with short collection times. It is ideally suited for biological systems in water. ChemSight is a relatively new product designed to measure and identify minute quantities of hazardous gases and vapors with wide area coverage. The system is designed for continuous open path measurements with a line of sight of up to 100 m. A wide range of toxic materials are handled, with sensitivities ranging from 2 ppm/m to 200 ppm/m with identification

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Spectroscopy - May 2008 Contents A Pragmatic Approach to Managing Interferences in ICP-MS Pittcon 2008: Back to New Orleans and Coffee and Beignets for Breakfast News Market Profile Calendar

Spectroscopy - May 2008

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