Reference Label	Details
est unc	estimated uncertainty
Watanabe 1973	I. Watanabe, Y. Yokoyama, and S. Ikeda, Chem. Phys. Lett. 19, 406-409 (1973) Vibrational Structures in the Photoelectron Spectrum of Formic Acid
Watanabe 1973a	I. Watanabe, Y. Yokoyama, and S. Ikeda, Bull. Chem. Soc. Jpn. 46, 1959-1963 (1973) Lone Pair Ionization Potentials of Carboxylic Acids Determined by He(I) Photoelectron Spectroscopy