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UV–Vis Spectrum

UV–Vis Spectrum

When light passes through a substance, a portion of the light is absorbed while the remaining light is reflected or transmitted. If the molecule absorbs light between the wavelengths of 180–400 nm range, the UV spectrum is obtained, and if it absorbs light in the 400–780 nm wavelength range, the visible spectrum is obtained.
The UV–Vis spectrum of a molecule is the plot of its absorbance versus wavelength. The plot is drawn by taking molar...

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ARL Spectral Fitting as an Application to Augment Spectral Data via Franck-Condon Lineshape Analysis and Color Analysis

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Published on: August 19, 2021

The CXSFIT spectral fitting code: Past, present and future.

E Delabie¹, M G O'Mullane^2,3, M von Hellermann⁴

¹Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.

The Review of Scientific Instruments

|August 19, 2024

Summary

This summary is machine-generated.

The CXSFIT code efficiently analyzes complex spectroscopic data from magnetically confined plasma experiments. Its long-standing development and advanced features ensure accurate spectral fitting for current and future fusion devices.

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Area of Science:

Plasma Physics
Spectroscopy
Computational Physics

Background:

Magnetically confined plasma experiments produce extensive spectroscopic data.
Analyzing this data requires fitting spectral models to complex spectra.
The CXSFIT code has a long history of development for spectral fitting on JET.

Purpose of the Study:

To document the current capabilities and underlying philosophy of the CXSFIT spectral fitting code.
To detail algorithms for efficient numerical calculation of spectral features.
To outline potential future applications of CXSFIT for next-generation fusion devices like ITER.

Main Methods:

Utilizes constrained Gaussian spectral lines for fitting.
Incorporates time-dependent and non-linear parameter couplings.
Employs a "fit recipe" system for traceability and reproducibility.

Main Results:

CXSFIT efficiently fits numerous spectra with coupled parameters.
Recent updates include flexible background subtraction and advanced coupling schemes.
The code supports Zeeman and motional Stark effect multiplets.

Conclusions:

CXSFIT is a robust and versatile tool for analyzing spectroscopic data from various fusion devices.
Its design ensures traceability and adaptability for evolving research needs.
The code provides a foundation for future spectral fitting frameworks, including for ITER.