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The Far-Infrared Absorption Spectrum of HDO: Experimental Line Positions, Accurate Empirical Energy Levels, and a Recommended Line List.
Molecules
November 2024
University Grenoble Alpes, CNRS, LIPhy, 38000 Grenoble, France.
The far-infrared absorption spectrum of monodeuterated water vapor, HDO, is analyzed using three high-sensitivity absorption spectra recorded by high-resolution Fourier transform spectroscopy at the SOLEIL synchrotron facility. The gas sample was obtained using a 1:1 mixture of HO and DO leading to a HDO abundance close to 50%. The room temperature spectra recorded in the 50-720 cm range cover most of the rotational band.
View Article and Find Full Text PDFQuantitative analysis of branched high-density polyethylene content using far-infrared spectroscopy.
Spectrochim Acta A Mol Biomol Spectrosc
November 2024
Graduate School of Human Development and Environment, Kobe University, 3-11 Tsurukabuto, Nada, Kobe, Hyogo 657-8501, Japan. Electronic address:
This study describes a simple method for estimating the content of branched high-density polyethylene using spectroscopy including the terahertz region. Herein, we prepared samples by blending high-density polyethylene with a blend ratio of 0 %-100 % of branched and linear polyethylene. Then, the terahertz absorption spectra of these samples were recorded from 600 to 50 cm (18-1.
View Article and Find Full Text PDFPhotoelectric tunable-step terahertz detectors: a study on optimal antenna parameters, speed, and temperature performance.
Nanophotonics
April 2024
Cavendish Laboratory, University of Cambridge, CB3 0HE Cambridge, UK.
Field effect transistors have shown promising performance as terahertz (THz) detectors over the past few decades. Recently, a quantum phenomenon, the in-plane photoelectric effect, was discovered as a novel detection mechanism in gated two-dimensional electron gases (2DEGs), and devices based on this effect, photoelectric tunable-step (PETS) THz detectors, have been proposed as sensitive THz detectors. Here, we demonstrate a PETS THz detector based on GaAs/AlGaAs heterojunction using a dipole antenna.
View Article and Find Full Text PDFDeveloping an Analysis Procedure and Dispersion Model for Pristine and W-Doped VO Thin Films Using Density Functional Theory and Spectroscopic Ellipsometry.
ACS Appl Mater Interfaces
December 2024
Institut National de la Recherche Scientifique Centre Énergie Matériaux et Télécommunications, 1650 Boulevard Lionel-Boulet, Varennes J3X 1P7, Canada.
Vanadium dioxide (VO) and its unique phase transition from semiconductor to metal near room temperature ( = 68 °C) offer significant potential for applications in smart materials and advanced technologies. This transition is accompanied by a drastic modulation of VO's optical properties in the near- and far-infrared regions. Tungsten (W) has been successfully used as a dopant to lower the transition to room temperature.
View Article and Find Full Text PDFAtacama Large Aperture Submillimeter Telescope (AtLAST) science: The hidden circumgalactic medium.
Open Res Eur
June 2024
Institute of Theoretical Astrophysics, University of Oslo, Oslo, Oslo, Norway.
Our knowledge of galaxy formation and evolution has incredibly progressed through multi-wavelength observational constraints of the interstellar medium (ISM) of galaxies at all cosmic epochs. However, little is known about the physical properties of the more diffuse and lower surface brightness reservoir of gas and dust that extends beyond ISM scales and fills dark matter haloes of galaxies up to their virial radii, the circumgalactic medium (CGM). New theoretical studies increasingly stress the relevance of the latter for understanding the feedback and feeding mechanisms that shape galaxies across cosmic times, whose cumulative effects leave clear imprints into the CGM.
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