"Spectroscopic studies of the alkaline earth oxides, hypermetallic oxides and molecular anions," Michael Heaven (Emory University)

Date: 
Wednesday, January 30, 2019 - 9:30am to 10:30am
Series: 
AMO Seminars

Our studies of simple group IIA molecular ions have two primary motivations.  The first is associated with the potential for creating and manipulating oxide ions under ultra-cold conditions.  Spectroscopic data for the oxide ions are needed for the characterization of internal state population distributions and state manipulations.  Initial experiments of this kind have focused on diatomic ions (e.g., BaO+, CaO+).  However, it is also apparent that ultra-cold polyatomic ions may be generated in a similar fashion.  The neutral MOM hypermetallic oxides are of interest in their own right, having markedly multi-reference singlet ground states.  Electronic spectra and theoretical calculations for BeOBe, MgOMg and CaOCa are discussed.  Our measurements represent the first steps towards characterizing the MOM+ cations by means of two-color photoionization spectroscopy.

            A second interest is in the ability of the alkaline earth chalcogenides and halides to form stable anions.  For example, theoretical predictions for BeO- yield an electron binding energy of 2.15 eV and the existence of dipole-bound electronically excited states.  We have examined       BeO-, BeS- and BeF- by means of slow electron velocity map imaging spectroscopy.  Accurate electron affinities and insights concerning electron detachment dynamics are obtained from these measurements.

Event Attachments: 
Location: 
PAB 4-330