NIST Chemistry WebBook
Thermochemical data for over 5000 organic and small inorganic compounds. Reaction thermochemistry data for over 8000 reactions. IR spectra for over 7500 compounds. Mass spectra for over 10,000 compounds. UV/Vis spectra for over 400 compounds. Electronic and vibrational spectra for over 3000 compounds. Constants of diatomic molecules (spectroscopic data) for over 600 compounds. Ion energetics data for over 14,000 compounds. Thermophysical property data for 16 fluids.