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Extra info for Advances in Chemical Physics: The Excited State in Chemical Physics, Part II, Volume 45
4. ” for use in the dipole (e, 2e) electron-impact simulation of PES. , at this angle the intensities are independent of the asymmetry parameter /3 and can thus be used to derive relative total partial cross sections). , in those energy regions where only a single ionization process occurs and where total ionization equals total absorption). The predicted results have been verified,23as shown in Fig. 9, which shows the curve to be close agreement with the value for TeJderived using the ejected electron spectra of Opal et aLa2This method has two special features of importance for coincidence spectrometers.
IV. Experimental Considerations 33 In photoelectron spectroscopy the same considerations discussed in the preceding section apply with regard to the collection efficiency of electrons ejected in the photoionization process. 90,9’”* on the Daresbury synchrotron. 8 eV to obtain a number of points on the partial oscillatorstrength curves for states of CO+ . This experiment necessitated the measurement of photon flux for each line which is a difficult and tedious procedure. I8 have illustrated the possibility of using such a light source for UV molecular photoelectron spectroscopy.
I t is clear from the preceding discussion that the normal plane-wave method will not, in general, yield good results near the ionization threshold. Two avenues of improvement have been suggested within the single-particle approximation framework. a. For diatomic molecules exact one-electron functions are available for HT in ellipsoidal coordinates. These are used as the basis for a much more accurate calculation of the continuum wave function. ’8s1 7 1 . 1 7 2 These calculations are limited to the energy region below 20 eV.