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Title:ATTENUATED TOTAL REFLECTANCE SPECTROSCOPY OF LIQUIDS USING A MID-IR DUAL FREQUENCY COMB SPECTROMETER
Author(s):Herman, Daniel I.
Contributor(s):Coddington, Ian; Newbury, Nathan R.; Baumann, Esther; Giorgetta, Fabrizio; Waxman, Eleanor; Ycas, Gabriel
Subject(s):Mini-symposium: Frequency-Comb Spectroscopy
Abstract:Since its inception, dual comb spectroscopy (DCS) has enabled a variety of new spectroscopic applications\footnote{Ian Coddington, Nathan Newbury, and William Swann, "Dual-comb spectroscopy," Optica 3, 414-426 (2016)}. Here, we report on the extension of a broad bandwidth, high coherence DCS system to mid-infrared (MIR) spectroscopy of liquid-phase samples in the C-H stretch region ($\sim$2800 to 3100 \wn). Each comb originates from a self-referenced Er:fiber oscillator with a repetition rate of 200 MHz. Using a two-branch difference frequency generation (DFG) configuration, each comb is downconverted to the MIR, which yields output tunable from 2.6 to 5.2 $\mu$m with up to 100 mW in a single instantaneous bandwidth. Using attenuated total reflectance (ATR) coupling techniques, spectra of the pure isopropanol C-H stretch are recorded in 1.5 second integration periods consisting of $\sim$100 phase-corrected, averaged interferograms and show excellent agreement with reference spectra. A fitted average of 50 integration periods is shown in the abstract image. Initial estimates show that baseline fluctuations on the order of 2\% will dominate sensitivity models. Further, we demonstrate progress towards the use of our DCS system as an analytical tool for organic reaction monitoring. We use an aldol condensation reaction as a test case where we detect C$_{\mathrm{sp}^3}$-H stretches in the reactant (acetone) and C$_{\mathrm{sp}^2}$-H stretches in the product (mesityl oxide). Methods for quantitative analysis of the aldol condensation will be discussed. Finally, this talk will explore the compatibility of DCS and newly-developing micro-reactor waveguide technology.
Issue Date:06/19/18
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Genre:Conference Paper / Presentation
Type:Text
Language:English
URI:http://hdl.handle.net/2142/100472
DOI:10.15278/isms.2018.TA09
Other Identifier(s):TA09
Date Available in IDEALS:2018-08-17
2018-12-12


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