https://data.nist.gov/pdr/lps/EBC9DB05EDEE5B0EE043065706812DF85
https://diabloanalytical.com/product/nist-mass-spectral-library-new-license/
https://www.sisweb.com/software/ms/nist17.pdf
https://periodictable.com/Properties/A/ElectronShellConfiguration.bt.html