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Title:Automated microwave double resonance spectroscopy: a tool to identify and characterize chemical compounds
Author(s):Martin-Drumel, Marie-Aline
Contributor(s):Crabtree, Kyle N.; McGuire, Brett A.; Patterson, David; McCarthy, Michael C.
Subject(s):Spectroscopy as an analytical tool
Abstract:Owing to its unparalleled structural specificity, rotational spectroscopy is a powerful technique to unambiguously identify and characterize volatile, polar molecules. We present here a new experimental approach, automated microwave double resonance (AMDOR) spectroscopy, to rapidly determine the rotational constants of these compounds without any \textit{a priori} knowledge of elemental composition or molecular structure. This task is achieved by rapidly acquiring the classical (frequency vs. intensity) broadband spectrum of a molecule using chirped-pulse Fourier transform microwave (FTMW) spectroscopy, and subsequently analyzing it in near-real time using complementary cavity FTMW detection and double resonance. AMDOR measurements provide a unique ``barcode'' for each compound from which rotational constants can be extracted. To illustrate the power of this approach, AMDOR spectra of three aroma compounds --- \textit{trans}-cinnamaldehyde, $\alpha$- and $\beta$-ionone --- have been recorded and analyzed. The prospects to extend this approach to mixture characterization and purity assessment are described.
Issue Date:2016-06-22
Publisher:International Symposium on Molecular Spectroscopy
Genre:Conference Paper / Presentation
Rights Information:Copyright 2016 by the authors
Date Available in IDEALS:2017-01-26

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