Abstract
New (2+1) resonantly enhanced multiphoton ionization (REMPI) spectra of ArKr in the region of Kr*(5p) and Ar*(4s) between ≊92378.8 and 94250.7 cm−1 are presented. A time-of-flight (TOF) mass spectrometer was used to obtain single isotopomer data. Four band systems, two previously observed by Dehmer and Pratt [J. Chem. Phys. 88, 4139 (1988)], and two new ones, have been vibrationally analyzed. Excited state bond lengths have been found from Franck–Condon factor calculations while electronic symmetries were assigned from REMPI spectra recorded with circularly polarized light. Our excited state symmetry assignments differ from those recently proposed by Heck et al. [J. Phys. Chem. 99, 17700 (1995)]. The unusual vibrational band intensity distributions observed for some of the electronic systems are rationalized qualitatively in terms of interstate avoided crossings.
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