Quantum yields, double photoionization molecules

Figure 7 The photoionization quantum yields (rji) of CH4, C2H6, and C3H8 as a function of the incident photon energy measured via the double ionization chamber and synchrotron radiation as mentioned in Section 2.1. The energy resolution of the incident photon energy at 20 eV is as follows 32 meV for CH4, 29 meV for C2H6, and 29 meV for C3H8. The vertical ionization potentials of the ionic states involved are indicated by the vertical bars for each molecule [11]. (From Ref. [7]. Reprinted with permission from Elsevier Science.)...

Figure 15. Quantum yields of double photoionization, as defined in the text, for a selection of molecules and for atomic Xe, with the wavelengths used.

Quantum yields in double photoionization involving deep inner shells of molecules have not yet been determined, but are expected to show the same general pattern of behavior. 

For some molecules the quantum yield of double photoionization is low and the electron energy distributions are both flat and relatively smooth. This... 

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