Figure 4-26 shows an energy loss spectrum for He measured in an apparatus such as that shown in Figure 4-24a. Use the spectrum to construct and draw carefully to scale an energy-level diagram for He.

Figure 4-24(a)

Transcribed Image Text:

FIGURE 4-26 Energy-loss spectrum of helium. Incident electron energy was 34 eV. The elastically scattered electrons cause the peak at 0 eV. Relative intensity 0 20.61 19.82 10 Energy loss, eV 20 21.21 23.07