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Ashburn, J.R. and Cline, R.A. and Stone, C.D. and van der Burgt, Peter J.M. and Westerveld, W.B. and Risley, J.S. (1989) Experimental determination of the H(n=3) density matrix for 80-keV H+ on He. Physical Review A, 40 (9). pp. 4885-4901. ISSN 1050-2947