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Diffraction dissociation of both the beam and target particles has been observed in 150-GeV/c .ir--p interactions in the Fermilab 30-in.-bubble-chamber--proportional-wirechambe hybrid spectrometer. The dissociations are observed as recoil systems opposite leading particles, the signals of which are separated from background where appropriate by a variant of the Van Hove sector cut, thus allowing the high-mass portion of the spectrum to be observed. Pion dissociation has a cross section of 1758-t. 105 pb, divided among two-, four., and six-prong events; some p0 production is seen and comes primarily from the n--t2n-.ir + channel. The proton dissociation cross section is 1726, 100 pb, again divided among two-, four-, and six-prong events. The final state contains a neutron more frequently than a proton in the twoand six-prong events, a proton more frequently in the four-prong events. Production of A + + is observed in the p +p.irf T -dissociations. transferring four-momenhim to other particles,

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Equation (22) indicates that, in this approximation, the electron sees two charges of magnitude \e separated by a distance V^« 0 . For a ruby laser beam of intensity 2* 10 11 W/cm 2 , V2a 0 is approximately 0.8