Beneath the surface.
Beyond the peak.

A spectrum is a beginning. Build a model, inspect its assumptions,
and let the evidence shape the story.

ORIGINAL SCIENTIFIC COREON YOUR DEVICEOPEN SCIENCE

SURFACE & PHOTOELECTRONSLIVE STUDY

Photoemission + resolved peaksILLUSTRATIVE MODEL

Excitation energy50%

Your surface-analysis workspace is ready.

01 / OBSERVATIONLOCAL ONLY

Bring the surface to light.

↥Choose an XPS spectrumCSV · TXT · TSV · DAT · VGD / up to 2 MB

No spectrum loaded.

Energy scale & import options

Energy scalePhoton energy / eV

Text files use numeric energy and intensity columns. Check the import audit and preview before fitting. For kinetic data, declare the source energy.

Import audit & raw data

The import choices and data checks will appear here.

Energy / eV	Intensity

02 / HYPOTHESISINSPECTABLE

Give the signal structure.

BackgroundNoise objective

ROI minimum / eVROI maximum / eVEnergy shift / eVCount scale

Positive shift increases binding energy. ROI bounds refer to shifted energies. Poisson mode requires raw, nonnegative counts.

Components 0 / 8

Launch the lab and load a spectrum to build your model.

Background & optimizer settings

Edge fractionMax evaluationsLow-energy edge levelHigh-energy edge level

Blank edge levels use the original estimator. Backgrounds remain fixed during each fit. Tougaard uses the original engine defaults. Local errors exclude background and calibration uncertainty.

YOUR DATA. YOUR DEVICE.

Calculations run in a local browser worker. Your spectra and results are never uploaded. Export a project to keep your work.

Open project ↥

Refreshing clears unsaved work. The lab shares EIS’s cached scientific runtime.

THE SURFACE, RESOLVED

Separate the signals.
Keep the whole picture.

MeasuredTotal modelBackgroundBinding energy decreases from left to right

hν → e⁻

The next discovery starts here.

Launch the lab, then bring your spectrum or explore the demo.

03 / EVIDENCE

A fit you can question.

Fit your spectrum to inspect parameters, local uncertainties, and model diagnostics.

A WIDER FIELD OF VIEW

Survey the possibilities.

Exploratory element candidates from the original reference library. Use a survey spectrum with broad energy coverage. Confirm candidates using companion lines, overlaps, and experimental context.

Load a survey spectrum to explore possible elements.

OPEN METHODS. SHARED CREDIT.

Let the method travel.

Built from Ali Afruz’s XPS Master v0.2.0 scientific core. Please cite the software version when you use this lab in research.

Citation & desktop edition ↗MIT license

Web adapter v1.0 · core pinned to 4c7329763954. The desktop edition includes multi-spectrum workspaces, model comparison, global fitting, stability reports, and Manuscript Plotter.

Profiles, background choices, and local uncertainties do not establish chemical identity. Check residuals and independent evidence. AICc/BIC comparisons require the same observations and noise assumptions.

Beneath the surface.Beyond the peak.