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AxisBenchTechniquesFTIR spectrum analysis

FTIRInfrared spectroscopy

FTIR spectrum analysis with open library matching.

Correct the baseline, build the band table and match your spectrum against 20,762 infrared spectra from Open Specy and RRUFF. Every step is a named setting saved with the result.

Start free What it computes
FTIR resultField names, not sample data
Band position
cm⁻¹
Band intensity
on the recorded signal basis
Signal basis
%T, absorbance, normalised
Region area
per declared region
Library candidate
name, source entry
Similarity score
cosine or Pearson

Each value is saved with the processing settings and library version that produced it.

Reference spectra
20,762 open infrared spectra
Sources
Open Specy, RRUFF
Files
CSV, TXT, TSV, Excel, JCAMP-DX
Price
Free plan, no credit card

01 · What it computes

From raw spectrum to ranked candidates.

Every transform is a named, parameterised step. Settings save as presets and run across a batch of spectra.

  • Axis and absorbance

    Wavenumber in cm⁻¹, or wavelength in µm or nm, converted on request. Transmittance converts to absorbance with A = −log₁₀ T.

  • Smoothing and baseline

    Savitzky–Golay, moving-average or Gaussian smoothing. AsLS, linear or rubberband baseline, with an optional baseline region.

  • Normalisation

    Vector, max or SNV normalisation, recorded with the result so spectra compare on the same basis.

  • Band table

    Bands are detected by prominence, distance and a maximum count. Each row records the axis unit and the signal it was found on.

  • Band areas

    Integrate the regions you declare, one line each with low and high limits and a label, and see which bands fall inside each region.

  • Library matching

    Cosine or Pearson similarity across the full library, with a candidate count and minimum score. Templates for general FTIR and functional-group screening.

02 · Reference library

The whole library, searched on every match.

Every reference is hosted on our servers and compared on every run, not a demo subset. The library is identical on Free, Pro, Lab and Enterprise.

Catalog published 28 September 2026 Free on every plan
FTIR
20,762
infrared spectra
Open Specy, RRUFF

How a spectrum match is made

  1. Your processed spectrum goes in.

    Smoothing, baseline and normalisation come from the settings you chose, and they are saved with the match.

  2. The whole library is compared.

    Your spectrum is compared curve against curve with all 20,762 FTIR references, then peak overlap is checked for the shortlist.

  3. Candidates come with their scores.

    Each candidate shows its similarity score and its spectrum beside yours. Candidates are evidence for your interpretation, not a verdict.

  4. Sources stay attached.

    Every record keeps its source and attribution in your export, and relevant papers retrieved from OpenAlex sit next to the result.

Where the reference spectra come from

SourceRecords in the catalogWhat it providesTermsCost
Open Specy FTIR 19,937 Community spectral library from the Moore Institute for Plastic Pollution Research Mixed provenance, contributing organization kept on every record. Free download, no account Free
RRUFFUniversity of Arizona FTIR 825 Measured infrared spectra of characterised, well-documented mineral samples Free with citation, Lafuente et al. 2015 Free

Record counts are from the catalog published on 28 September 2026. Each source keeps its own license, and attribution travels with every matched record and exported report.

03 · Files and limits

What goes in, and what it does not claim.

Supported files

  • CSV, TXT, TSV and ExcelColumns are mapped to the spectral axis and signal at import, and quality warnings show before anything is computed.
  • JCAMP-DXSingle-spectrum .jdx, .dx and .jcamp files with one ##XYDATA block. Multi-block, NTUPLES and peak-table JCAMP files are not supported.

Limits

  • Candidates, not verdictsA high similarity score is evidence for your interpretation, not an identification.
  • No invented assignmentsThe band table records what was detected. It does not label bands with functional groups on its own.
  • JCAMP-DX scopeOne spectrum per file, as uncompressed ##XYDATA.
  • ExportsTables as CSV or XLSX, figures as PNG and reports as DOCX or PDF. The whole project downloads as a file you can reopen later.

Other techniques in the same project

DSC, TGA, DTA, FTIR, Raman and XRD data live side by side in one AxisBench project. Full multi-technique reports come with Pro.

Match your next FTIR spectrum.

The Free plan includes every technique and the full reference libraries, with 10 analyses a month (up to 3 a day). Pro removes the limits.

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