Two photon spectra of electronic states of Kr2 and ArKr near the Kr* 4p55p states

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Abstract
The two photon resonant, three photon ionization spectra of Kr2 and ArKr were determined in the energy region of the Kr* 5p[3/2]1, 5p[3/2]2, and 5p[1/2]0 states. The spectrum of Kr2 displays three new band systems that arise from two photon transitions from the ground state to excited states of gerade symmetry. The analysis of the observed vibronic structure of these band systems provides new information on the dissociation energies and the potential energy curves of the low‐lying dipole forbidden excited gerade states of Kr2. A photoelectron spectrum determined following (2+1) excitation via an intense peak of the band system dissociating to Kr 1S0+Kr* 5p[1/2]0 provides the first observation of the weakly bound C 2Π3/2u state and the repulsive B 2Π1/2g and D 2Σ+1/2g states of Kr2. The (2+1) ionization spectra for both ArKr and KrXe were examined in the same energy region. For ArKr, a band system analogous to that observed in Kr2 was observed near the Kr* 5p[1/2]0 state, and an additional band system was observed near the Ar* 4s[3/2]01 state. No structure was observed for KrXe.