Analytical Chemical Sensing using high resolution Terahertz/submillimeter wave spectroscopy

Abstract

Molecular ro-vibrational spectral signatures enable chemical sensors that are highly sensitive and selective. These sensors compare favorably to establish techniques for gas analysis. Unlike methods based on mass spectrometry (MS), Terahertz/submillimeter (THz/smm) spectrometers do not require calibration and rely on library spectra for quantitative analysis, thus eliminating the need for calibration, usually done via analysis of calibration standards. They interrogate a very large number of resolution elements and approach near ‘absolute’ specificity of chemical detection. In an ongoing experiment we attempt to perform first of a kind chemical analysis of a TO-14 calibration standard mix of 39 volatile organic compounds diluted in Nitrogen. 26 chemicals in the mixture are spectroscopically active in the THz range. Here we present our most recent results and analysis. This proof of principle study will serve as basis of our future research in chemical sensing with focus on analysis of exhaled human breath.