By D.R. Bates (ed.), Benjamin Bederson (ed.)
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Additional info for Advances in Atomic and Molecular Physics, Vol. 14
The separation between 1"' and 2 is 80meV, and 25 meV energy resolution was required to resolve the 1"' and 2 peaks in the work of Golden et al. (1974b). When the energy resolution was deliberately made poorer, the two features degenerated into one. The position of 2-2' is in good agreement with the position of this feature as observed by Kuyatt et al. (1965), Gibson and Dolder (1969), and Golden and Zecca (1970). When allowance is made for the differences in energy scale calibration (see Section III,D) the agreement is excellent.
So an elastic scattering experiment at extremely high-energy resolution is possible within the present technology. As a further example we consider the separation of the excitation of the n = 2 levels in helium. In this case the resolution of the monochromator is defined by the closest spacing of the n = 2 levels, which is 254 meV. 25eV, and it then takes about 11 times longer to achieve the same signal-to-noise ratio at 50 meV resolution by the usual method than by using the method suggested here to measure these excitation cross sections.
I -I- I ....... .... : , ' . ... . ... . . .. .. '+i. 6 I . .. 0 .... 23. Excitation functions of the 33S, 3'S, 43S, 4'S, 5 j S , 5 ' S , and 6's states of He in order of threshold energy (from Heddle, 1977). The positions of the (ls,ns')'S, (ns,np)'P, (lD,npZ)'D, and 'S resonances are marked with solid lines. The broken lines are at the positions of resonances as a result of extrapotation.