Photodissociation spectroscopy of Ca+–CO2

Electronic spectra are observed for the metal cation complex Ca+–CO2, using resonance-enhanced photodissociation spectroscopy. The complexes are produced in a laser vaporization/supersonic expansion source, size selected and excited on resonance, and the mass-analyzed product is measured in a time-o...

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Veröffentlicht in:The Journal of chemical physics 1996-09, Vol.105 (9), p.3579-3585
Hauptverfasser: Scurlock, C. T., Pullins, S. H., Duncan, M. A.
Format: Artikel
Sprache:eng
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Zusammenfassung:Electronic spectra are observed for the metal cation complex Ca+–CO2, using resonance-enhanced photodissociation spectroscopy. The complexes are produced in a laser vaporization/supersonic expansion source, size selected and excited on resonance, and the mass-analyzed product is measured in a time-of-flight mass spectrometer. Both Ca+ and CaO+ dissociation channels are observed to have sharp resonances. Spectra from two isotopomers, the 40Ca+ and 44Ca+ species, are recorded and analyzed. Transitions from the X 2Σ+(v″=0) ground vibronic state to several vibrational levels in the D 2Πr excited electronic state are measured. The structure of the complex is confirmed to be linear by the presence of prominent spin–orbit multiplets. Spectroscopic constants for the 40Ca+–CO2 complex are determined: ν00=22 099.1 cm−1, Aso′=136.3 cm−1, ωe′=258.9 cm−1, and ωexe′=4.23 cm−1.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.472229