Dynamics of Atoms and Molecules

Johnson, Mark R.; Kearley, Gordon J.

doi:10.1016/b978-0-12-398374-9.00007-3

Cited by 3 publications

(3 citation statements)

References 77 publications

(66 reference statements)

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“…In doing so, we want to determine the limit of detection (LOD) and the limit of quantitation (LOQ) for the TOSCA , neutron spectrometer at ISIS Facility, as well as its analytical sensitivity (AS). INS allows access to microscopic dynamics in materials. , When an incident neutron of appropriate energy exchanges energy with a system, this quantized energy-transfer excites one or more vibrational modes. These can thus be identified by studying the energy loss of scattered neutrons.…”

Section: Introductionmentioning

confidence: 99%

“…These can thus be identified by studying the energy loss of scattered neutrons. INS spectroscopy provides highly specific chemical information content and, therefore, is capable of uniquely identifying target analytes. , This is particularly true for hydrogen compounds for which excellent discrimination of hydrogen vibrations can be obtained, thanks to the large scattering cross section of the H atom combined with its large scattering-to-absorption ratio . This makes H the most detectable of all elements in the periodic table, when using INS.…”

Section: Introductionmentioning

confidence: 99%

“…INS allows access to microscopic dynamics in materials. 5,6 When an incident neutron of appropriate energy exchanges energy with a system, this quantized energy-transfer excites one or more vibrational modes. These can thus be identified by studying the energy loss of scattered neutrons.…”

Section: Introductionmentioning

confidence: 99%

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Hydrogen Detection Limits and Instrument Sensitivity of High-Resolution Broadband Neutron Spectrometers

et al. 2022

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The limits of detection (LOD) and quantitation (LOQ) in the mass domain, for broadband vibrational spectroscopy with neutrons on the TOSCA spectrometer at the ISIS Pulsed Neutron and Muon Source (UK), have been studied. The well-known 3σ and 10σ approaches are used through a specifically developed analytical procedure that is based on the calculation of the integrated spectral intensities in selected energy-transfer ranges, as a function of mass of standard reference materials and calibrants, such as ZrH 2 , 2,5diiodothiophene, and low-density polyethylene. The analysis shows that the blank, that is, the instrument setup without the analyte, plays a critical role in the measurement performance, especially for small specimen quantities. The results point that TOSCA enables detection of 128 μmol (LOD H ) and quantitation of 428 μmol (LOQ H ) of elemental hydrogen analytes in ZrH 2 . The determined values for this and other standards allow for the assessment of the calibration curve design and instrument sensitivity and define a method to be used for inelastic neutron scattering spectrometers such as TOSCA, or VESPA, the new beamline under construction at the European Spallation Source in Lund (Sweden).

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