CAS Number Search - The NIST WebBook

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Search for Species Data by CAS Registry Number

Please follow the steps below to conduct your search:

  1. Enter a registry number (e.g., 74-82-8):
  2. Select the desired units for thermodynamic data: SI calorie-based
  3. Select the desired type(s) of data:
    Thermodynamic Data Other Data
    Gas phase IR spectrum
    Condensed phase THz IR spectrum
    Phase change Mass spectrum
    Reaction UV/Vis spectrum
    Ion energetics Gas Chromatography
    Ion cluster Vibrational & electronic energy levels
    Constants of diatomic molecules
    Henry's Law
  4. Press here to search:

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Copyright for NIST Standard Reference Data is governed by the Standard Reference Data Act.

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