Interferences in electrón emisión from O2 by 30 MeV O5,8+ impact

M. WINKWORTH; P.D. FAINSTEIN; M.E. GALASSI; J. BARAN; B.S. DASSANAYAKE; S. DAS; A. KAYANI; J.A. TANIS

NUCLEAR INSTRUMENTS AND METHODS IN PHYSICS RESEARCH B - BEAM INTERACTIONS WITH MATERIALS AND ATOMS

Año: 2009 vol. 267 p. 373 - 376

0168-583X

Interference structures in the ejected electron spectra for 30 MeV O5,8+ +O2 are investigated.  The measured electron yields were studied for electron energies from 5 to 400 eV and observation angles of 30,60,90, 120. and 150. with respect to the incident beam direction. Experimental molecular cross-sections were normalized to theoretical molecular one-center cross-sections revealing oscillatory structures suggestive of secondary interferences as evidenced by the independence on the observation angle. An oscillation interval for 30 MeV O5,8+ +O2 of Dk 4 a.u. is found, a value two times larger than that previously observed for 3 MeV H+ +N2. No obvious evidence for primary Young-type interferences was seen.