1 E.. Riedle, S.H. Ashworth, J.T. Farrell Jr., and D.J. Nesbitt, Review of Scientific Instruments 65, (1994).
1 M.A. Suhm, J.T. Farrell Jr., S.H. Ashworth, and D.J. Nesbitt, The Journal of Chemical Physics 98, (1993).