Abstract
Pulsed-field-ionization zero-kinetic-energy (PFI-ZEKE) photoelectron spectra of ArKr have been recorded in the wavenumber range 108,000–118,000 cm−1 using a 1 + 1′ two-photon resonant excitation scheme from the ground X 0+ state of ArKr via selected intermediate states located just below the Ar(1S0) + Kr([5p[1/2]0) dissociation limit. The positions of ionic vibrational levels with quantum numbers from 1 to 30, from 0 to 8 and from 0 to 6 were determined for the X(1/2), A1(3/2) and A2(1/2) states, respectively. The assignment of absolute vibrational quantum numbers of the ionic states was derived from the isotopic shifts of the spectral lines. Combining these data with literature data on the B(1/2) → X(1/2), C1(3/2) → A1(3/2) and C2(1/2) → A2(1/2) band systems of ArKr+ enabled the derivation of potential energy functions for the lowest six electronic states of ArKr+ using a global potential model that includes the effects of the spin-orbit, charge-exchange and long-range interactions.
Acknowledgements
We thank Dr. O. Zehnder for useful discussions. This work is supported financially by the Swiss National Science Foundation under project No. 200020-116245.