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Accurate molecular spectroscopy in the mid-infrared (mid-IR) region allows precision measurements with applications in fundamental physics. We present our on-going work towards measuring absolute vibrational frequencies of various polyatomic species — in particular methanol — around 10 μm, at an unprecedented level of accuracy, using a both ultra-stable and widely tuneable near-infrared frequency...
Rotational spectra of the methylamine and acetaldehyde molecules were recorded in the frequency range between 80 and 120 GHz with sub-Doppler spectral resolution. Such resolution was achieved by means of Lamb-dip observation. The main aim of this study was to search for the torsionally mediated anomalous high-J hyperfine splittings in acetaldehyde and methylamine molecules, similar to that ones recently...
This paper describes a spectroscopic system for gas sensing applications. It is based on SiGe transmitters (TXs) and receivers (RXs) operating at frequencies around 245 GHz and 500 GHz. 2f spectra of volatile organic compounds (VOCs) were obtained using wavelength modulation spectroscopy (WMS). Chemometrical analysis of the spectra is performed by applying several multivariate analysis (MVA) techniques.
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