Electron Capture from Elliptical Rydberg States in Edgewise Collisions.
Abstract
The dependence of the cross section for electron capture by singly charged ions from coherent elliptic Na Rydberg states on the direction of the weak electric field (F≈ 1 V/cm) applied to the target has been measured. The nucleus-to-aphelion direction of the elliptical state is parallel to F. K^+ ions with reduced velocities tilde v = v_ion/v_electron = 0.5 and 0.7 struck the oriented Na(n=24) elliptical states in edgewise collisions. Na(n=24) eccentricities varied from ɛ = 0.1 to 0.99. The elliptical states were prepared in a ``Stark barrel''( K.B. MacAdam, D.M. Homan, O.P. Makarov and O.P. Sorokina, in Proc. 14th Int. Conf. on the Application of Accelerators in Research and Industry) (AIP Press, NY, to be published 1997). using an adiabatic crossed-fields method. The angle between F and the ion beam was varied from θ = 15^circ to 345^circ. The ratio of total-capture cross sections from the elliptical state and from the 25s state was measured at each velocity and eccentricity. The data show good agreement with classical-trajectory n-swap calculations.(D.M. Homan, M.J. Cavagnero and D.A. Harmin, Phys. Rev. A 50), R1965 (1994).
- Publication:
-
APS April Meeting Abstracts
- Pub Date:
- April 1997
- Bibcode:
- 1997APS..APR.G1580S