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Related Experiment Video

Updated: Jul 7, 2026

Excitation-Scanning Hyperspectral Imaging Microscopy to Efficiently Discriminate Fluorescence Signals

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Published on: August 22, 2019

Sources of systematic errors in line intensities.

J H Shaw¹, N Tu, D L Agresta

¹Ohio State University, Physics Department, Columbus, Ohio 43210, USA.

|August 1, 1985

Summary

Accurate spectral line intensity measurements require precise linewidth and spectral resolution values. Incorrect assumptions lead to systematic errors in line intensity analysis, impacting astrophysical and atmospheric studies.

Area of Science:

Spectroscopy
Astrophysics
Atmospheric Science

Background:

Line intensities are crucial for quantitative analysis in spectroscopy.
The curve of growth method relates line intensity to physical conditions.
Accurate determination of spectral parameters is essential for reliable results.

Purpose of the Study:

To investigate the impact of assumed linewidth and spectral resolution on line intensity measurements.
To demonstrate the systematic errors introduced by incorrect spectral parameters.

Main Methods:

Analysis of simulated weak Lorentz-shaped spectral lines.
Evaluation of line intensities under varying linewidth and spectral resolution assumptions.

Main Results:

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Line intensities are sensitive to assumed linewidth and spectral resolution.
Deviations from true values introduce systematic errors in calculated line intensities.
The linear region of the curve of growth is particularly affected.

Conclusions:

Precise knowledge of linewidth and spectral resolution is critical for accurate line intensity determination.
Incorrect spectral parameters lead to unreliable quantitative spectroscopic analysis.
Careful consideration of instrumental and line profile effects is necessary.