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Microscopic mapping of infrared modulated photoluminescence spectra with a spatial resolution of ∼2 μm.
Rev Sci Instrum
December 2024
State Key Laboratory of Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 200083 Shanghai, China.
Infrared photoluminescence (PL) spectroscopy with micron-scale spatial resolution is essential for the optoelectronic characterization of narrow-gap microstructures and single defects, yet it poses significant challenges due to the exceedingly weak PL signal and strong background thermal emission. This work introduces an infrared micro-PL (μPL) mapping system that achieves a spatial resolution of ∼2 μm, leveraging the inherent advantages of the step-scan Fourier transform infrared spectrometer-based modulated PL technique in the mid- and far-infrared regions. The configuration of the experimental system is described, and a theoretical upper limit of spatial resolution is derived to be about 1.
View Article and Find Full Text PDFThe competition between cation-anion and cation-triglyme interaction in solvate ionic liquids probed by far infrared spectroscopy and molecular dynamics simulations.
Chemphyschem
December 2024
Universitat Rostock, Physikalische Chemie, Albert-Einstein-Straße 27, 18059, Rostock, GERMANY.
Glyme-based electrolyte solutions provide new concepts for developing suitable lithium-ion batteries. The so-called solvate ionic liquids (SILs) are promising electrolytes. They are most efficient in equimolar mixtures of lithium bis(trifluoromethanesulfonyl)imide ([Li][NTf2]) and glyme, wherein the [Li]+ cation is supposedly fully solvated by glyme molecules.
View Article and Find Full Text PDFShort-time collective dynamics of an ionic liquid: A computer simulation study with non-polarizable and polarizable models, and ab initio molecular dynamics.
J Chem Phys
December 2024
Laboratório de Espectroscopia Molecular, Departamento de QuÃmica Fundamental, Instituto de QuÃmica, Universidade de São Paulo, 05513-970 São Paulo, SP, Brazil.
Molecular dynamics (MD) simulation is used to study the intermolecular dynamics in the THz frequency range of the ionic liquid 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide, [C2C1im][FSI]. Non-polarizable and polarizable models for classical MD simulation are compared using as quality criteria ab initio molecular dynamics (AIMD) and experimental data from far-infrared (FIR) spectroscopy and previously published data of inelastic x-ray scattering (IXS). According to data from IXS spectroscopy, incorporating polarization in the classical MD simulation has relatively little effect on the dispersion curve (excitation frequency vs wavevector) for longitudinal acoustic modes.
View Article and Find Full Text PDFThe 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 0Â %-100Â % of branched and linear polyethylene. Then, the terahertz absorption spectra of these samples were recorded from 600 to 50Â cm (18-1.
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