The differential cross sections for excitation of atomic hydrogen isotopes to their n=2 states by proton or deutron impact are found to follow a simple scaling relationship. The momentum-transfer-scaled differential excitation cross sections, for a projectile velocity of 1.26 a.u., produce one differential cross-section curve for all four possible hydrogen-isotope collision systems. The experimental results are in excellent agreement with our Glauber-approximation calculations.
E. P. Rille et al., "Momentum-Transfer Scaling in Hydrogen-Isotope Collision Systems," Physical Review A, vol. 27, no. 6, pp. 3369-3371, American Physical Society (APS), Jun 1983.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevA.27.3369
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