Magnetic-bottle and velocity-map imaging photoelectron spectroscopy of APS- (A = C14H10 or anthracene): electron structure, spin-orbit coupling of APS•, and dipole-bound state of APS-

August 4, 2018

Journal Article

Magnetic-bottle and velocity-map imaging photoelectron spectroscopy of APS- (A = C14H10 or anthracene): electron structure, spin-orbit coupling of APS•, and dipole-bound state of APS-

Abstract

Gaseous dibenzo-7-phosphanorbornadiene P-sulfide anions APS- (A = C14H10 or anthracene) were generated via electrospray ionization, and characterized by magnetic-bottle photoelectron spectroscopy, velocity-map imaging (VMI) photoelectron spectroscopy, and quantum chemical calculations. The electron affinity (EA) and spin-orbit splitting (SO) of the APS• radical are determined from the photoelectron spectra and Franck-Condon factor simulations to be EA = 2.62 ± 0.05 eV and SO splitting = 43 ± 7 meV. VMI photoelectron images show strong and sharp peaks near detachment threshold with an identical electron kinetic energy (eKE) of 17.9 meV at three different detachment wavelengths, which are therefore assigned due to autodetachment from dipole-bound anion states. The B3LYP/6-31++g(d,p) calculations indicate APS• has a dipole moment of 3.31 Debye, large enough to support a dipole-bound electron.

Revised: December 12, 2019 | Published: August 4, 2018

Citation

Yuan Q., Z. Yang, R. Li, W.J. Transue, Z. Li, L. Jiang, and N. Govind, et al. 2018. Magnetic-bottle and velocity-map imaging photoelectron spectroscopy of APS- (A = C14H10 or anthracene): electron structure, spin-orbit coupling of APS•, and dipole-bound state of APS-. Chinese Journal of Chemical Physics 31, no. 4:463-470. PNNL-SA-135150. doi:10.1063/1674-0068/31/cjcp1805114