Abstract
Combining a theoretical and experimental investigation of electron momentum spectroscopy (EMS) of the N 1s hole (2σ −1 and 3σ −1) orbitals in NNO (X 1Σ +), we demonstrate a direct and pronounced manifestation of a chemical shift of the molecule. Evidence from both binding-energy spectra and the corresponding orbital momentum distributions are presented for the chemical shift of 3.4 eV in ionization energy and differences of wave functions of NNO between the terminal N (3σ −1 N T) and center N (2σ −1 N C).
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