Knowledge Bank

The aluminum complexes were prepared in a metal cluster source and identified with a time-of-flight mass spectrometer. The electronic spectra of the complexes were measured with single-photon ZEKE-PFI (zero electron energy pulsed field ionization) technique. The ZEKE spectrum of $AlNH3$ shows vibronic transitions from two spin-orbit levels of the neutral ground electronic state, which allows the measurements of the following spectroscopic constants: ionization potential $(39746cm-1)$, spin-orbit splitting $(58cm-1)$, $Al-NH3$ symmetric stretching frequencies $(\omega 3+=339cm-1$, $\omega 3+x3+=3.1cm-1$, and $\nu 3=227cm-1)$, and Al-N symmetric bending frequency $(\nu 6+=557cm-1)$. The ZEKE spectrum of $AlNH2(CH3)$ displays at least four progressions, from which two vibrational modes (365 and $160cm-1$) may be identified.