The electronic spectrum of the C 0 + , D 1 ← X 0 + transitions of KrXe has been studied at high resolution in the vicinity of the Kr(1 S 0) + Xe 6p[5/2] 2 dissociation limit by resonance-enhanced (1+1 ′) two-photon ionization spectroscopy. The rotational structure of 13 bands, 5 and 8 of which correspond to transitions to levels of 0 + and 1 symmetry, respectively, were observed in the spectra of several isotopomers, and the hyperfine structure in the spectrum of the Ω = 1 levels of 84 Kr 129 Xe was determined. The five transitions to levels of 0 + symmetry form a regular progression of bands characterized by a regular rotational structure and corresponding to high vibrational levels (with v = 16 − 20) of the C 0 + state. The C 0 + state is found to possess significant X 1/2, A 1 3/2 and A 2 1/2 ion-core character in combination with an excited electron of 6pσ, 6pπ and 6sσ character, respectively, and to correlate adiabatically to the Kr(1 S 0) + Xe 6s[1/2] o 1 dissociation limit. The transition to the eight levels of Ω = 1 symmetry form a very irregular progression both as far as spectral positions and intensities are concerned. Rotational levels of f-symmetry, accessed via Q-branch transitions, are weakly predissociated by a repulsive level associated with the Kr(1 S 0) + Xe 6s[1/2] o 0 limit. A local perturbation in the rotational structure of the fourth level of Ω = 1 symmetry enabled the identification of a so far unobserved predissociative level of Ω = 1 or Ω = 2 symmetry with band center near 77318.5 cm −1. The determination of the band centers, rotational constants and isotopic shifts of the Ω = 1 levels led to the conclusion that the level structure is affected by homogeneous perturbations and that at least two electronic states of Ω = 1 symmetry contribute to the spectrum of KrXe in this spectral region. Modelling the observed rovibronic structure using a coupling model involving low vibrational levels of a weakly bound Ω = 1 state associated with the Kr(1 S 0) + Xe 6s[1/2] o 1 dissociation limit and high vibrational levels of a more strongly bound state associated with the Kr(1 S 0) + Xe 6p[5/2] 2 dissociation limit enabled us to reproduce the observed values of the rotational constants, vibronic positions and intensity distribution in a qualitatively satisfactory manner. However, the model failed to account for the observed isotopic shifts. Rotationally resolved photoelectron spectra of the KrXe + X 1/2 ← KrXe C 0 + and KrXe + A 1 3/2 ← KrXe C 0 + ionizing transitions were recorded from selected rotational levels of selected isotopomers of KrXe. The rotational levels of the X 1/2 state of KrXe + group as pairs of levels of opposite parity and have a spin-rotation coupling constant γ of approximately −2B, as a consequence of pure precession. The rotational level structure of the low-lying electronic states of KrXe + thus appear to form the same patterns as the corresponding states of ArXe + .