Photodissociation spectroscopy of Mg+2

K. F. Willey, Chen-Sheng Yeh, D. L. Robbins, M. A. Duncan

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48 Citations (Scopus)


Mg+CO2 ion-molecule complexes are produced in a pulsed supersonic nozzle cluster source. These weakly bound complexes are mass-selected and studied with laser photodissociation spectroscopy in a reflectron time-of-flight mass spectrometer system. An electronic transition assigned as 2Π←X 2Σ+ is observed with an origin at 29625 cm-1 (vac). The spectrum is characterized by a six-member progression in the metal-CO2 stretching mode with a frequency (ω′e) of 381.8 cm-1. An extrapolation of this progression fixes the excited state dissociation energy (D′0) at 11194 cm-1. The corresponding ground state value (D″0) is 5150 cm-1 (14.7 kcal/mol). The 2Π 1 2, 3 2 spin-orbit splitting is 56 cm-1. These studies were guided by ab initio calculations by Bauschlicher and co-workers, which provide accurate predictions of the electronic transition energy, vibrational constants and dissociation energy.

Original languageEnglish
Pages (from-to)179-184
Number of pages6
JournalChemical Physics Letters
Issue number2-3
Publication statusPublished - 1992 May 1

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Physical and Theoretical Chemistry


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