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| http://dx.doi.org/10.1007/s00428-023-03664-w | DOI Listing |
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A novel technique for performing fiber pigtailed DFB laser and linear Fabry-Pérot cavity based optical feedback cavity enhanced absorption spectroscopy (OF-CEAS) is proposed. A fiber-coupled electro-optic modulator (f-EOM) with x-cut y-propagation LiNbO waveguide is employed, instead of PZT used in traditional OF-CEAS, to correct the feedback phase, which improves the compactness and applicability of OF-CEAS. Through the efficient and real-time control of the feedback phase by actively changing the input voltage of the f-EOM, a good long-term stability of the signal has been achieved.
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Department of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, Alberta T6G 2G2, Canada.
Intermolecular interactions between pyruvic acid, the simplest α-keto acid, and water are important in bio- and atmospheric chemistry. In this context, the pure rotational spectrum of the pyruvic acid-water complex was measured from 7 to 15 GHz using a cavity-based Fourier-transform microwave spectrometer. In the detected isomer, water acts as a hydrogen bond donor and acceptor, bridging the acidic hydrogen and the keto oxygen.
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Department of Chemistry, University of Alberta, 11227 Saskatchewan Drive, Edmonton, Alberta T6G 2G2, Canada.
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