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Unmasking blended optogalvanic lines: composite spectrum center-of-gravity metrology with a Monte–Carlo uncertainty chain.

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Title: Unmasking blended optogalvanic lines: composite spectrum center-of-gravity metrology with a Monte–Carlo uncertainty chain.
Authors: Simien, Clayton E.1 (AUTHOR) cesimien@uab.edu
Source: Applied Physics B: Lasers & Optics. Mar2026, Vol. 132 Issue 3, p1-11. 11p.
Subjects: Monte Carlo method, Gadolinium, Spectral lines
Abstract: Optogalvanic (OG) spectra of heavy atoms frequently manifest as blended clusters of isotopic and hyperfine components. We present an analysis chain that (i) fits a physics-aware composite Voigt model, (ii) defines the reported line center as the cluster's center-of-gravity (COG), and (iii) propagates calibration and dynamic effects together with fit statistics by a hierarchical Monte–Carlo (MC). An effective two-pole RC model quantifies bias from the combination of laser scan and lock-in detection. When applied to the spin-forbidden transition of neutral Gd near 726 nm, the method yields a corrected COG with combined standard uncertainty at the tens-of-megahertz level despite sub-200 kHz statistical fit noise. The workflow is compact, reproducible, and portable to other OG/hollow-cathode spectra. [ABSTRACT FROM AUTHOR]
Copyright of Applied Physics B: Lasers & Optics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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DbLabel: Engineering Source
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  Data: Unmasking blended optogalvanic lines: composite spectrum center-of-gravity metrology with a Monte–Carlo uncertainty chain.
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  Data: <searchLink fieldCode="AR" term="%22Simien%2C+Clayton+E%2E%22">Simien, Clayton E.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> cesimien@uab.edu</i>
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  Data: <searchLink fieldCode="JN" term="%22Applied+Physics+B%3A+Lasers+%26+Optics%22">Applied Physics B: Lasers & Optics</searchLink>. Mar2026, Vol. 132 Issue 3, p1-11. 11p.
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  Data: Optogalvanic (OG) spectra of heavy atoms frequently manifest as blended clusters of isotopic and hyperfine components. We present an analysis chain that (i) fits a physics-aware composite Voigt model, (ii) defines the reported line center as the cluster's center-of-gravity (COG), and (iii) propagates calibration and dynamic effects together with fit statistics by a hierarchical Monte–Carlo (MC). An effective two-pole RC model quantifies bias from the combination of laser scan and lock-in detection. When applied to the spin-forbidden transition of neutral Gd near 726 nm, the method yields a corrected COG with combined standard uncertainty at the tens-of-megahertz level despite sub-200 kHz statistical fit noise. The workflow is compact, reproducible, and portable to other OG/hollow-cathode spectra. [ABSTRACT FROM AUTHOR]
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  Data: <i>Copyright of Applied Physics B: Lasers & Optics is the property of Springer Nature and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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        Value: 10.1007/s00340-026-08647-8
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      – SubjectFull: Spectral lines
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      – TitleFull: Unmasking blended optogalvanic lines: composite spectrum center-of-gravity metrology with a Monte–Carlo uncertainty chain.
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              Text: Mar2026
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