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Frequency and time domain F ENDOR spectroscopy: role of nuclear dipolar couplings to determine distance distributions.
Phys Chem Chem Phys
December 2024
Research Group ESR Spectroscopy, Max Planck Institute for Multidisciplinary Sciences, Am Fassberg 11, Göttingen, Germany.
F electron-nuclear double resonance (ENDOR) spectroscopy is emerging as a method of choice to determine molecular distances in biomolecules in the angstrom to nanometer range. However, line broadening mechanisms in F ENDOR spectra can obscure the detected spin-dipolar coupling that encodes the distance information, thus limiting the resolution and accessible distance range. So far, the origin of these mechanisms has not been understood.
View Article and Find Full Text PDFLaser heterodyne detection boasts exceptional advantages such as high spectral resolution and high signal-to-noise ratio (SNR). It excels at capturing spectral line broadening information of upper atmospheric molecules, which presents substantial research value in the realms of greenhouse gas profile measurement and the assessment of laser propagation effects in the atmosphere. This paper delves into the investigation of the processing method for heterodyne signals, adopting a non-modulated signal processing method to construct a near-infrared non-modulated laser heterodyne radiometer.
View Article and Find Full Text PDFTunable diode laser absorption spectroscopy (TDLAS) is used to measure the 6s S-5d6p D absorption line profile of a Ba atomic beam produced in a molecular beam epitaxy (MBE) reactor. Despite the noisy MBE environment, a signal-to-noise ratio up to 100 is obtained thanks to a thorough optimization of the measurement setup. A model that realistically describes this absorption profile is presented, taking into account the angular distribution of atomic concentration in the atomic beam as well as the reactor and setup geometry.
View Article and Find Full Text PDFSpin Coupling in a Lewis Trisaccharide as Evidence of Inter-Residue C-H···O Hydrogen Bonding in Aqueous Solution.
J Am Chem Soc
November 2024
Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556-5670, United States.
Prior studies of the solution conformation of the Lewis (Le) trisaccharide, αFuc-(1→3)[βGal-(1→4)]-βGlcNAc, suggest that nonclassical inter-residue C-H···O hydrogen bonding in aqueous solution contributes to the stabilization of its 3D structure and affects its biological properties. Experimental evidence for this hydrogen bond in aqueous solution has been reported in the form of a NMR spin-coupling constant between C5'Fuc and H1″Gal measured by 2D NMR methods in unlabeled samples. A methyl glycoside of Le (MeβLe) was prepared containing selective C-labeling at C5'Fuc, and the H1″Gal signal was examined in high-field H NMR spectra for evidence of splitting or line-broadening caused by the C at C5'Fuc.
View Article and Find Full Text PDFNanoconfinement effects on the dynamics of an ionic liquid-based electrolyte probed by multinuclear NMR.
Soft Matter
October 2024
Chemistry of Interfaces, Luleå Tekniska Universitet, Luleå SE-97187, Sweden.
The measurement of ion diffusivity inside nanoporous materials by Pulsed-Field Gradient (PFG) NMR is not an easy task due to enhanced NMR relaxation. Here, we employed multinuclear (H, P, and Li) NMR spectrometry and diffusometry to probe ion dynamics of a fluorine-free battery electrolyte comprising the [P][MEEA] ionic liquid (IL) and LiMEEA salt in a 7 : 3 molar ratio, confined in three different nanoporous SiO glasses with pore diameters of 3.7, 7 and 98 nm.
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