Notes: An assessment of some closed-form expressions for the Voigt function III: Combinations of the Lorentz and Gauss functions

Schreier, Franz

doi:10.1016/j.jqsrt.2019.01.017

Cited by 8 publications

(2 citation statements)

References 32 publications

(75 reference statements)

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“…Participant #13 used a pseudo-Voigt function rather than a Lorentzian function and some differences in peak metrics such as Γ 2D may be expected, as a pseudo-Voigt function is a linear combination (not a convolution) of Lorentzian and Gaussian curves [83]. To explore the effect of peak fit function on the relative difference due to data analysis, participant #13's data was re-fitted with a pseudo-Voigt function in OriginPro (OriginLab) as used as for a comparison between the participant and LP data.…”

Section: Peak Fitting Functionsmentioning

confidence: 99%

International interlaboratory comparison of Raman spectroscopic analysis of CVD-grown graphene

Turner¹,

Paton²,

Legge³

et al. 2022

2D Mater.

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There is a pressing need for reliable, reproducible and accurate measurements of graphene’s properties, through international standards, to facilitate industrial growth. However, trustworthy and verified standards require rigorous metrological studies, determining, quantifying and reducing the sources of measurement uncertainty. Towards this effort, we report the procedure and the results of an international interlaboratory comparison (ILC) study, conducted under Versailles Project on Advanced Materials and Standards (VAMAS). This ILC focusses on the comparability of Raman spectroscopy measurements of chemical vapour deposition (CVD) grown graphene using the same measurement protocol across different institutes and laboratories. With data gathered from 17 participants across academia, industry (including instrument manufacturers) and national metrology institutes, this study investigates the measurement uncertainty contributions from both Raman spectroscopy measurements and data analysis procedures, as well as provides solutions for improved accuracy and precision. While many of the reported Raman metrics were relatively consistent, significant and meaningful outliers occurred due to differences in the instruments and data analysis. These variations resulted in inconsistent reports of peak intensity ratios, peak widths and the coverage of graphene. Due to a lack of relative intensity calibration, the relative difference reported in the 2D- and G peak intensity ratios (Ι_2D/Ι_G) was up to 200%. It was also shown that the standard deviation for Γ_2D values reported by different software packages, was 15× larger for Lorentzian fit functions than for pseudo-Voigt functions. This study has shown that by adopting a relative intensity calibration and consistent peak fitting and data analysis methodologies, these large, and previously unquantified, variations can be significantly reduced, allowing more reproducible and comparable measurements for the graphene community, supporting fundamental research through to the growing graphene industry worldwide. This project and its findings directly underpin the development of the ISO/IEC standard “DTS 21356-2 - Nanotechnologies - Structural Characterisation of CVD-grown Graphene”.

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Section: Peak Fitting Functionsmentioning

confidence: 99%

International interlaboratory comparison of Raman spectroscopic analysis of CVD-grown graphene

Turner¹,

Paton²,

Legge³

et al. 2022

2D Mater.

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“…Schreier [38,43,44] has extensively reviewed this subject. The Voigt function is a powerful tool that has important applications in many fields of science.…”

Section: Spectral Fitting Programme Thermo No-lifmentioning

confidence: 99%

The accuracy and precision of multi-line NO-LIF thermometry in a wide range of pressures and temperatures

Foo

Lamoureux

Cessou

et al. 2020

Journal of Quantitative Spectroscopy and Radiative Transfer

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An automated spectral fitting algorithm (named Thermo NO-LIF) designed for the extraction of temperature information from experimental NO-LIF spectra is presented and analysed. With the aid of the Thermo NO-LIF, the high-accuracy (0.5%) of multi-line NO-LIF thermometry are demonstrated in the burnt-gases region of a near-adiabatic Bunsentype premixed flame. The results are compared with the temperature measured using N 2 spontaneous Raman scattering (SRS). The current study also applies and analyses the algorithm and the thermometry technique in a premixed flat-flame under various subatmospheric pressures. The results suggest that choosing a long excitation scan range with as few overlapping lines as possible can maximise the performance of the multi-line NO-LIF thermometry. The uncertainty arising from the overlapping lines is especially crucial at atmospheric pressure. Additionally, the current study compares the performance of multi-line NO-LIF thermometry using narrowband and broadband lasers. Thermo NO-LIF is available to anyone interested in applying multi-line NO-LIF thermometry.

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Analysis and Simulation of EPR Spectra of Photoexcited Triplet States

Strzelczyk,

Ciuti,

Carella

et al. 2023

Appl Magn Reson

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Notes: An assessment of some closed-form expressions for the Voigt function III: Combinations of the Lorentz and Gauss functions

Cited by 8 publications

References 32 publications

International interlaboratory comparison of Raman spectroscopic analysis of CVD-grown graphene

International interlaboratory comparison of Raman spectroscopic analysis of CVD-grown graphene

The accuracy and precision of multi-line NO-LIF thermometry in a wide range of pressures and temperatures

Analysis and Simulation of EPR Spectra of Photoexcited Triplet States

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