The He I and Mg Kα photoelectron spectra of TNAP in the vapor and solid state were measured. The first ionization potentials in the vapor and solid states are determined to be 8.67 and 7.80 eV respectively. The interpretation of the observed photoelectron spectra is carried out with the aid of photoelectron spectroscopic data of related compounds and the results of a CNDO/2 calculation. The N is peak of TNAP shows a shake-up satellite.
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