Ion Collisions With Rydberg Atoms In Strong Electric Fields
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 and n=20 Rydberg atoms at velocities 1<~vve<~10 where ve=n-1 a.u. Electric fields which ionize product Rydberg atoms in states n′=n+Δn with Δn=1,A A andA 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. © 1981 The American Physical Society.