Documentation & Math

Multi-File Workflow

This tool allows you to analyze multiple datasets simultaneously.

• Import: Upload one or multiple .csv/.txt files at once with Add Files or by drag and drop.
• Select to Edit: In the File List (sidebar), click the icon next to a file to make it "Active".
• Adjust: Switch to the Analysis tab in the sidebar. Any changes to units, thickness, or fit range apply only to the active file.
• Compare: Use the checkboxes in the File List to hide/show specific plots.

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Data

Data can be exported in several ways.

• CSV: Raw spectra and caalculated Tauc plot can be saved as CSV with the Download CSV button.
• Report: The PDF Report will save a timestamped PDF file with all the graph and the calculations results.
• Plots: Plots can be zoomed in or out and they can be saved as PNG files; see the utilities icons in the top right part of the chart.

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Absorbance & Transmittance Mode

Calculates Absorption Coefficient (α) for films or liquids.

• Input %T is converted: A = 2 - log10(%T)
• α: α = (2.303 × A) / d
  (Where d is sample thickness in cm)

Reflectance Mode (Kubelka-Munk)

Calculates F(R) for powders and diffuse surfaces.

• F(R): F(R) = (1 - R)2 / (2 × R)
• Note: R is automatically normalized to 0-1 range if input is %.

Tauc Equations

Auto-Detect Features

The "Magic Wand" button in the Analysis tab automatically attempts to find the linear region of the absorption edge. It defaults to the top 40% of the energy spectrum where the fundamental absorption usually occurs.