Advances in Atomic and Molecular Physics, Vol. 14 by D.R. Bates (ed.), Benjamin Bederson (ed.)

By D.R. Bates (ed.), Benjamin Bederson (ed.)

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978eV in the photodetachment of H - ) has been discussed by Macek (1967) (see Fig. 16). The openand closed-channel resonances have been discussed by Lin (1975) and Broad and Reinhardt (1976). The closed-channel resonance observed by Bryant et al. (1977) is possibly the highest energy closed-channel peak seen in Fig. 15. Attempts to observe the open-channel effect in the emission from an arc discharge plasma by Ott et al. (1975) and in stellar spectra by Snow (1975) have both been unsuccessful. The location of resonances near but below the a = 3 levels has been difficult experimentally because of the obscuring effects of molecular hydrogen resonances due to the failure to dissociate the target beam completely.

E. 70 lnddrm energy k V ) FIG. 13. , 1974). (Copyright by The Institute of Physics. ) ofthe S-matrix in the vicinity of the 23S threshold by continuing the analytic form of the S-matrix in the vicinity of the (1s 2s2)2 S resonance across the 23S threshold using effective range theory. This type of procedure was used, for example, by Burke (1965) to estimate the S-wave contribution to the 23S excitation cross section. The matrix element corresponding to elastic scattering is, from Eq (1l), s0 -- e 2 i d o E - E, - i r / 2 E - E, ir/2 where 6, is the nonresonant S-wave phase shift r = ky2K and the scattering matrix is continued across the threshold according to the prescription iK = k , .

There are three features that are weak and sharp in Fig. 39eV, which is outside the bounds. These weak and sharp features are also seen in the 3D excitation functions. The weak features in the “non-Feshbach” energy regions are a problem. They are much too long-lived to be shape resonances and similar structures can be seen in the results of Sanche and Schulz (1972a) although they did not comment on them. As discussed previously, some additional weak features have been observed by Golden et al. 24.

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