Dear Ed,
the formula in the LAB system is
tan(theta1)*tan(theta2) = 2*me/(Ebeam+me)
Simon
-- Simon Sirca MIT-LNS, Room 26-402 Tel: +1 617 258-5438 77 Massachusetts Avenue Fax: +1 617 452-5950 Cambridge, MA 02139-4307, USA URL: http://pierre.mit.edu/~sirca
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