10min:
AN OPTICAL-OPTICAL DOUBLE-RESONANCE SPECTROSCOPIC STUDY OF FOUR ION-PAIR STATES OF CLF AND IDENTIFICATION OF THE CLF(A) VALENCE STATE.

V. A. ALEKSEEV AND D. W. SETSER, Chemistry Department, Kansas State University, Manhattan, KS 66506.

Four ion-pair states of ClF, E~0+(3P2), f~0+(3P0), ß~1(3P2) and G~1(3P1), have been identified by sequental excitation via the B~3Pi0+ valence state. Excitation spectra and fluorescence spectra have been acquired, which permit the assignment of vibrational energies and rotational constants to 31 levels. These four ion-pair states exhibit complex homogeneous and heterogeneous interactions and neither the vibrational nor rotational constants are regular with increasing vibrational quantum number. The vibrational and rotational constants of the A~3Pi1 state were identified from the low resolution ß-A emission spectra and the dissociation limits of ClF~(B~3Pi0+) and ClF(A~3Pi1) are discussed. The dissociation energy of ClF~(X) is confirmed to be 21110 cm-1. Some qualitative information also was obtained about the D'~2(3P2) and A'~3Pi2 states.