Photoelectron imaging of multiply charged anions:Effects of intramolecular Coulomb repulsion and photoelectron kinetic energies on photoelectron angular distributions

Journal Article · Tue Feb 17 04:00:00 EST 2009 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.3077230· OSTI ID:953797

Xing, Xiaopeng; Wang, Xue B; Wang, Lai S

Multiply charged anions possess strong intramolecular Coulomb repulsion (ICR), which has been shown to dictate photoelectron angular distributions PADs using photoelectron imaging. Here we report the effects of photoelectron kinetic energies on the PADs of multiply charged anions. Photoelectron images on a series of dicarboxylate dianions, ^-O₂C(CH₂)_nCO₂^-(D_n^2-, n = 3–11) have been measured at two photon energies, 532 and 266 nm. The first photoemission band of D_n^2-, which is a perpendicular transition in the absence of the ICR, comes from electron detachment of an O lone pair orbital on the –CO₂^- end groups. Recent photoelectron imaging studies at 355 nm show that the PADs of D_n^2- peak in the directions parallel to the laser polarization for small n due to the ICR, which directs the outgoing electrons along the molecular axis. The current data show much stronger parallel peaking at 532 nm, but much weaker parallel peaking in the 266 nm data, relative to the 355 nm data. These observations indicate that the ICR has greater influence on the trajectories of slow photoelectrons and much reduced effects on faster photoelectrons. This study demonstrates that the PADs of multiply charged anions depend on the interplay between ICR and the outgoing photoelectron kinetic energies.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 953797
• Report Number(s): PNNL-SA-65851; 25395; KC0301020
• Journal Information: Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 7 Vol. 130; ISSN JCPSA6; ISSN 0021-9606
• Publisher: American Institute of Physics (AIP)
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANGULAR DISTRIBUTION
ANIONS
COULOMB FIELD
ELECTRON DETACHMENT
ELECTRONS
Environmental Molecular Sciences Laboratory
IMAGES
ION CYCLOTRON-RESONANCE
KINETICS
LASERS
PHOTOEMISSION
PHOTONS
POLARIZATION
TRAJECTORIES