SPECIAL ISSUE ON SPECTRAL SENSING RESEARCH FOR WATER MONITORING APPLICATIONS & FRONTIER SCIENCE AND TECHNOLOGY FOR CHEMICAL, BIOLOGICAL AND RADIOLOGICAL DEFENSE (VOL. 2) – Frontier Session; EDITED BY J. JENSEN AND D. WOOLARDNo Access

CHIRPED-PULSE FOURIER TRANSFORM MICROWAVE SPECTROSCOPY: A NEW TECHNIQUE FOR RAPID IDENTIFICATION OF CHEMICAL AGENTS

JASON J. PAJSKI

Department of Chemistry, University of Virginia, McCormick Rd, Charlottesville, Virginia 22904-4319, USA

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MATTHEW D. LOGAN

Department of Chemistry, University of Virginia, McCormick Rd, Charlottesville, Virginia 22904-4319, USA

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KEVIN O. DOUGLASS

Department of Chemistry, University of Virginia, McCormick Rd, Charlottesville, Virginia 22904-4319, USA

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GORDON G. BROWN

Department of Chemistry, University of Virginia, McCormick Rd, Charlottesville, Virginia 22904-4319, USA

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BRIAN C. DIAN

Department of Chemistry, University of Virginia, McCormick Rd, Charlottesville, Virginia 22904-4319, USA

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BROOKS H. PATE

Department of Chemistry, University of Virginia, McCormick Rd, Charlottesville, Virginia 22904-4319, USA

To whom correspondence should be addressed.

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, and

RICHARD D. SUENRAM

Department of Chemistry, University of Virginia, McCormick Rd, Charlottesville, Virginia 22904-4319, USA

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https://doi.org/10.1142/S0129156408005114Cited by:5 (Source: Crossref)

Abstract

We have developed a new broadband Chirped-Pulse Fourier Transform Microwave (CP-FTMW) spectrometer that allows the microwave spectrum in the 7.5-18.5 GHz range to be measured in a single data event. This technique produces a pure rotational spectrum that can be used for unambiguous identification of any species having a permanent electric dipole moment. CP-FTMW is a gas phase technique that is ideally suited for the detection of airborne chemical warfare agents (CWA) which must be detected in trace amounts (<10 ppm in air). The high resolution of the technique allows the identification of complex mixtures without the need for a preliminary separation step, such as gas chromatography, which significantly reduces analysis time. The technique is “blind” to major atmospheric components (N₂, O₂, CO₂, H₂O) as they either do not posses a permanent dipole moment or do not absorb in the range of the spectrometer, thereby eliminating large background signals. In this paper we will present preliminary results that are focused on early detection of airborne CWA, including acquisition time, sensitivity limits, and sample handling requirements for several of these species.

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