Vibrationally resolved photoelectron spectroscopy of AlO− and AlO2−

Abstract Vibrationally resolved photoelectron spectra of AlO − and AlO 2 − have been obtained at two photon energies, 3.49 and 4.66 eV. Both the ground and first excited states are observed for AlO. The spectrum of AlO 2 − can only be obtained at the higher photon energy due to the high electron affinity (EA) of AlO 2 . The electron affinities of AlO and AlO 2 are measured to be 2.60(1) and 4.23(1) eV, respectively. The rather high EAs for both molecules are consistent with the fact that AlO − and AlO 2 − anions are closed-shell, isoelectronic with SiO and SiO 2 , respectively. The vibrational frequency of the AlO − anion is observed to be 900 (50) cm −1 . The vibrational frequencies and excitation energy obtained for AlO agree well with previous optical measurements. The totally symmetric vibrational frequency is observed to be 750 (40) cm −1 for AlO 2 and 680 (60) cm −1 for AlO 2 − . The AlO 2 molecule, as well as AlO 2 − , is concluded to have a linear OAlO structure from the spectroscopic information obtained.

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