Angular-momentum distributions following impact of slow ions on Na([ital nd]) Rydberg atoms

Journal Article · Sat May 01 00:00:00 EDT 1993 · Physical Review A; (United States)

DOI:https://doi.org/10.1103/PhysRevA.47.3913· OSTI ID:6648672

Sun, X; MacAdam, K B ^[1]

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1. Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055 (United States)

The degree of dipole-forbidden [ital l] change in Na(26[ital d]) and Na(28[ital d]) Rydberg atoms caused by slow Na[sup +] ion impact at reduced velocity [ital [tilde v]]=0.1--0.9 has been measured. Na[sup +] beam energies 7.3--684 eV were used. Previous measurements were greatly improved by reducing stray electric fields in the Rydberg collision region to about 10 mV/cm. The distributions of final-angular-momentum states were analyzed using directly measured diabatic selective-field-ionization profiles for [ital l]=3, 4, and 5. [ital l]-change results in Na(26[ital d]) and Na(28[ital d]) targets are very similar and clearly show an increasing amount of dipole-forbidden behavior for decreasing reduced velocities [ital [tilde v]] and partial agreement with the coupled-channel calculation of Beigman and Syrkin (Zh. Eksp. Teor. Fiz. 89, 400 (1985) [Sov. Phys. JETP 62, 226 (1985)]). The dipole-forbidden process is the main channel for angular-momentum change in ion--Rydberg-atom collisions at [ital [tilde v]][le]0.7. At very low energy ([ital [tilde v]][le]0.3) the measurements demonstrate that the final-state distributions are dominated by very high angular-momentum states.

• OSTI ID: 6648672
• Journal Information: Physical Review A; (United States), Journal Name: Physical Review A; (United States) Vol. 47:5; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

664300* -- Atomic & Molecular Physics-- Collision Phenomena-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
ALKALI METALS
ANGULAR MOMENTUM
ATOM COLLISIONS
CHARGED PARTICLES
COLLISIONS
DIPOLES
DISTRIBUTION FUNCTIONS
ELEMENTS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITED STATES
FORBIDDEN TRANSITIONS
FUNCTIONS
ION COLLISIONS
ION-ATOM COLLISIONS
IONS
METALS
MULTIPOLES
RYDBERG STATES
SODIUM
SODIUM IONS
VELOCITY