Photofragment spectroscopy and potential curves of Ar+2

Abstract

Photofragment energy distributions have been measured for the process Ar+2(2Σ+u)+hν→Ar++Ar using a 3 keV ion beam and cw lasers both coaxial and crossed with the ion beam, polarized, respectively, perpendicular and parallel to the ion beam direction. Measurements were made at 14 wavelengths between 4579 and 7993 Å. Transitions to the dissociative states 2Πg and 2Σ+g are observed, as are the effects of the spin–orbit interaction in Ar+2. The experimental results are used along with theoretical calculations to determine the 2Σ+u, 2Σ+g, and 2Πg potentials. The effects of the spin–orbit interaction on the potential curves, the magnitude and wavelength dependence of the photodissociation cross section, and the angular distributions of the photofragments are considered.

Pulsed-Field Ionization Zero-Kinetic-Energy Photoelectron Spectra of Ar2

“…We can determine vЈ D and the dissociation limit (D) with a standard deviation by following expressions [5] and [6], respectively.…”

On the role of dissociative ionization in the formation of argon dimer ions

“…While there is agreement on the ionization potential (IP) of the argon monomer [ 11 ] there is still some controversy about the IP of the dimer and trimer. For the IP of the dimer values of 14.44eV [12], 14.518 eV [13], 14.52eV [14] and 14.53 eV [15] have been reported. The binding energy of the neutral argon dimer is about 10 meV [16].…”

Direct photodissociation of SO+ via the 14Σ+ state

“…In contrast, there are relatively few studies of direct dissociation processes. Besides the prototype case H +, these are essentially limited to the a 4//._+f 4//, transition in O~ [4,5] and some studies on the molecular rare-gas ions He ] [6], Ar~ [7] and Kr~- [8]. A few other examples, which may be mentioned under this category, are Cs] [9] and O + [10].…”