The classical-trajectory Monte Carlo method has been used to investigate collisions of ions and Rydberg atoms in strong dc electric fields. Cross sections are presented for $n=10\mathrm{}$ and $n=20\mathrm{}$ Rydberg atoms at velocities $1<~\frac{v}{v_e}<~10$ where $v_e=n^{-1\mathrm{}}$ a.u. Electric fields which ionize product Rydberg atoms in states $n^{\prime }=n+\Delta n$ with $\Delta n=1, 2, \mathrm{and} 4$ were used. The electric field caused the cross sections for electron capture to decrease by up to fourfold while the ionization values increased by up to two orders of magnitude.

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