Electronic properties of dipole-bound (H_2O)_2~-, (D_2O)_2~-, (H_2O)_2~-Ar_(n = 1,2,3), and (D_2O)_2~-Ar_(n = 1,2,3) using negative ion photoelectron spectroscopy

摘要

We present the mass spectral and the photoclectron spectroscopic studies of dipole bound (H_2O)_2~-, (D_2O)_2~-, (H_2O)_2~-Ar_(n=1.2.3), and (D_2O)_2~-Ar_(n = 1.2.3). We measured vertical detachment energies (VDEs) of these dipole bound cluster anions and also estimated their adiabatic electron affinities (EA_as) to be close to their VDEs, respectively. The photoelectron spectra of (H_2O)_2~-Ar_(n = 1.2.3) and (D_2O)_2~-Ar_(n = 1.2.3) closely resemble those of (H2O)_2~-, respectively except for a slight successive spectral shift by approx 5 meV to a higher electron binding energy with additional argon atoms, which indicates that the argon atoms hardly perturb the water dimer anion geometry.