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chem-db-spectra

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Search and download experimental InfraRed (IR), Mass spectra, and UV-Vis spectra data (JCAMP-DX format) for molecules.

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chem-db-spectra

Goal

To query experimental molecular spectra—such as Infrared (IR), Mass Spectrometry, and UV-Vis—from standard experimental databases like the NIST Chemistry WebBook for baseline comparison against properties computed via MLIPs or DFT.

Instructions

Step 1. Query Spectra Data

Use the query_spectra.py script to fetch available spectrographic data for a given chemical formula. The script automatically searches the NIST Chemistry WebBook, resolves the compound, and downloads all available JCAMP-DX (.jdx) formatted spectra into the specified directory.

# Env: base-agent
python .agents/skills/chem-db-spectra/scripts/query_spectra.py <formula> <output_dir> [--type {IR,Mass,UVVis,All}]

Parameters:

  • formula: The chemical formula to query (e.g., CH4, C2H6O).
  • output_dir: The directory path to save the downloaded JCAMP-DX (.jdx) spectrum files.
  • --type: Filter the spectrum type to download (options: IR, Mass, UVVis, All). Default is All.

Constraints

  • Environments: The scripts require the base-agent Conda environment.
  • Spectrum Format: Output data is universally saved in JCAMP-DX (.jdx) standard format. You must use appropriate spectroscopic python package (e.g., jcamp) if you need to parse it back into numpy arrays.
  • Scraping Dependability: This script utilizes HTML scraping (beautifulsoup4). If the NIST WebBook layout changes in the future, the selectors may need to be updated.

References

  • Linstrom, P.J. and Mallard, W.G., Eds., NIST Chemistry WebBook, NIST Standard Reference Database Number 69, National Institute of Standards and Technology, Gaithersburg MD. URL
  • JCAMP-DX for Infrared, Raman, and Related Data. URL

Author: Bowen Deng Contact: GitHub @learningmatter-mit