ZEKE - PFI spectroscopy of 1 : 1 complexes of sodium with water and ammonia
نویسندگان
چکیده
ZEKE-PFI (zero kinetic energy pulsed field ionization) photoelectron spectra of the Na(H 20), Na(D20), Na(NH 3), and Na(ND3) complexes are reported. Spectra of all four complexes were obtained by single-photon ionization, and, for the Na(NH 3) and Na(ND3) complexes, by two-color (I+ I') photoionization as well, with the A E state serving as the intermediate resonance. Improved values for the ionization energies (IE) and intermolecular vibrational frequencies of the complexes were determined. The single-photon ZEKE-PFI spectra show transitions only between states of the same vibrational symmetry, in accord with the selection rule for allowed electronic transitions. Some of the two-color ZEKE-PFI spectra, however, show strong transitions between states of different vibrational symmetry which we attribute to vibronic coupling in the intermediate state.
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