Photodissociation Spectroscopy of the Mg(+)-CO2 Complex and Its Isotopic Analogs

摘要

Mg(+)-CO2 ion-molecule cluster complexes are produced by laser vaporization in apulsed nozzle cluster source. The vibronic spectroscopy in these complexes is studied with mass-selected photodissociation spectroscopy in a reflectron time-of-flight mass spectrometer. Two excited electronic states are observed: (2)2 sigma(+) and 2 pi. The 2 state has a vibrational progression in the metal-CO2 stretching mode (('omega sub e' = 381.8 /cm). The complexes are linear (Mg(+) -OCO) and are bound by the charge-quadrupole interaction. The dissociation energy (D sub o) is 14.7 kcal/mol. Corresponding spectra are measured for each of the 24, 25 and 26 isotopes of magnesium. These results are compared to theoretical predictions made by Bauschlicher and coworkers.