Detection of trace amount of water in volatile organic compounds by a K-band molecular rotational resonance spectroscopy
Twagirayezu, Sylvestre
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https://hdl.handle.net/2142/104409
Description
Title
Detection of trace amount of water in volatile organic compounds by a K-band molecular rotational resonance spectroscopy
Author(s)
Twagirayezu, Sylvestre
Contributor(s)
Neill, Justin L.
Mikhonin, Alex
Muckle, Matt
Singh, Sandeep C.
Issue Date
2019-06-18
Keyword(s)
Spectroscopy as an analytical tool
Abstract
Trace amount of water has been detected in ethanol (CH$_{3}$CH$_{2}$OH) and methanol (CH$_{3}$OH) using a K-Band BrightSpec Microwave Rotational Resonance (MRR) spectrometer in the 18-26 GHz frequency range. The design of this instrument is based on segmented Chirped Pulse Fourier Transform microwave wave (CP-FTMW) spectroscopy, which exploits recent advances in digital electronics to allow fast measurement of broadband rotational spectra of polar molecules. The analysis of the observed rotational spectra reveals the presence of a weak rotational line shape of water due to sensitivity of MRR to polar volatile organic compounds . The capability for K-band MRR to extract water in a such chemical environment has been further examined and validated by spiking samples with known small amount of water. The resulting linear curves allowed the determination of limit of detections at ppm level. These findings suggest that K-band MRR has potential to be useful as a spectroscopic tool for fast detection of water in volatile organic compounds or other raw materials.
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