Imaging Photoelectron Circular Dichroism in the Detachment of Mass-Selected Chiral Anions.

Photoelectron Circular Dichroism (PECD) is a forward-backward asymmetry in the photoemission from a non-racemic sample induced by circularly polarized light. PECD spectroscopy has potential analytical advantages for chiral discrimination over other chiroptical methods due to its increased sensitivity to the chiral potential of the molecule. The use of anions for PECD spectroscopy allows for mass-selectivity and provides a path to simple experimental schemes that employ table-top light sources.

Comparison of Conventional and Nonconventional Hydrogen Bond Donors in Au Complexes.

Although gold has become a well-known nonconventional hydrogen bond acceptor, interactions with nonconventional hydrogen bond donors have been largely overlooked. In order to provide a better understanding of these interactions, two conventional hydrogen bonding molecules (3-hydroxytetrahydrofuran and alaninol) and two nonconventional hydrogen bonding molecules (fenchone and menthone) were selected to form gas-phase complexes with Au. The Au[M] complexes were investigated using anion photoelectron spectroscopy and density functional theory.

Characterization of the Ground States of BeC and BeC via Photoelectron Velocity Map Imaging Spectroscopy.

Due to their potentially unique properties, beryllium carbide materials have been the subject of many theoretical studies. However, experimental validation has been lacking due to the difficulties of working with Be. Neutral beryllium dicarbide has been predicted to have a T-shaped equilibrium structure (), while previous quantum chemistry calculations for the structure of the anion had not yielded consistent results.

Dative Bonding between Closed-Shell Atoms: The BeF Anion.

Beryllium can exhibit unusually strong attractive interactions under conditions where it is nominally a closed-shell atom. Two prominent examples are the Be dimer and the He-BeO complex. In the present study, we examine the bonding of the closed-shell Be-F anion.

Photoelectron Velocity Map Imaging Spectroscopy of the Beryllium Sulfide Anion, BeS.

Slow electron velocity map imaging (SEVI) spectroscopy was used to examine the BeS anion to neutral ground-state transition, X Σ → X Σ. Rotational constants, vibrational intervals, and the electron binding energy of BeS were determined. Partially resolved rotational contours were seen due to the relatively small moment of inertia of beryllium sulfide.

Photodetachment spectroscopy of the beryllium oxide anion, BeO.

The XΣ→XΣ anion to neutral ground state photodetachment of BeO has been studied by means of photoelectron velocity-map imaging spectroscopy in a newly constructed apparatus. Vibrational intervals, rotational constants, and the electron detachment threshold of BeO were determined for the first time. The small moment of inertia of beryllium oxide allowed for the observation of partially resolved rotational contours.