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The ~~~l ~i c o t e e h n i q u e has been used in conjunction with a source ofcontinuum (synchrotron radiation) in order to determine the thresholds for fragmentation o f CF, into CF:+F+ (37.6eV). CF:+Ft(42.4eV), C F + + F + (47.5eV) and Ci+Ft(62.0eV).These thresholds are tentatively correlated with specific double-hole states of CF,.

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The rates of decay, both radiative and non-radiative, have been calculated far the valence shake-up States [us,vp]nl of N e ( u = 2 ) and Ar(v=3) for the five lowest n values. The various decay channels are discussed and trends far large n are examined. The calculations are performed at the single-configuration non-relativistic Hartree-Fock level. Inner-valence and valence-multiplet Auger channels arc shown to be completely dominant, with maximum fluorescence yields of 2.7% in Ne and 0.2% in Ar. The total decay rates can be larger than the corresponding atomic K-shell rates for certain states, an extreme example being the Ar [3s, 3p]('P)3d('P) rate of0.148 a". The calculated widths are shown to be consistent with the experimental results of Svensson el al. The valence-multiplet participator Auger transition is a mode of decay involving a change of multiplet state for the same initial and final two-hole valence configuration, and has been shown to account for the difference in width between certain photoelectron satellites in Ne. The experimental spectrum of Becker el 01 is discussed in the light of present results. The valence decay mechanisms identified are expected to have general applicability to light atoms and to molecules containing fint or second row atoms.

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