Research Papers in Physics and Astronomy


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Published in Europhys. Lett., 40 (2), pp. 129-134 (1997). Copyright 1997 EDP Sciences. Used by permission.


Using crossed atomic beams and mass spectrometric ion detection we have studied the formation of negative Ca ions in slow collisions between laser-excited state-selected Ne**(ns; J = 2) and Ne** (nd; J = 4) Rydberg atoms and ground state Ca atoms. The rate coefficients exhibit resonant behavior with maxima at an effective principal quantum number n* of about 11.5 and an estimated peak value of about 10-8 cm3 s-1. Two different theoretical calculations, based on a curve-crossing model and on a modified adiabatic theory, respectively, yield n*-dependences of the rate coefficients in good agreement with the experimental results.

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