SEARCH Articles Figures Tables A plot of the ratio AJA vs. na PJA for various AjF, Here A is the measured area of the resonance transmission dip in ev , A is the Doppler width of the level, F is the level width, n is the sample thickness in atoms cm, and Cq is the peak total cross section in cm atom. This extremely useful figure was prepared by the BNL [Publishers Imprint]