Studies of high charge state Rydberg ions

DePaola, B. D.; Axmann, W.J.; Parameswaran, R.; Lee, D.H.; Zouros, T. J. M.; Richard, Patrick

doi:10.1016/0168-583x(89)90953-1

Cited by 3 publications

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“…The details of the Rydberg analyser have been described elsewhere [13,20]. Briefly, a set of co-axial half cylinders are placed downstream from the collision region, with their common axis at 90 • to the beam.…”

Section: Methodsmentioning

confidence: 99%

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DePaola

Kanait

Richard

et al. 1996

J. Phys. B: At. Mol. Opt. Phys.

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Beats arising from the Stark mixing of neighbouring levels in highly excited hydrogen-like carbon have been observed. Unlike previous experiments, a Rydberg analyser was used to limit the range of quantum numbers detected in the region following the mixing field. The beats were studied as a function of , the mean principal quantum number passed by the Rydberg analyser. Analysis of the data shows that only a small subset of available quantum numbers are created in these collisions. A physical model for capture/excitation to high Rydberg states is presented which is consistent with these results.

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Section: Methodsmentioning

confidence: 99%

Untitled

DePaola

Kanait

Richard

et al. 1996

J. Phys. B: At. Mol. Opt. Phys.

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Field-ionizing lens system for the detection of high Rydberg states in multicharged ions of keV energies

Pesnelle

Andrä

1997

Review of Scientific Instruments

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Projectilendistributions following charge transfer ofAr+andNa+
MacAdam
¹
,
Gray
²
,
Rolfes
³

1990
Phys. Rev. A
39
0
4
0
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The n distributions produced by charge transfer of Ar+ and Na+ ions in a target of Na(nl) Rydberg atoms were extensively measured at intermediate velocities. The 60 -2100-eV ions bombarded a laser-excited atomic-beam target. The projectiles were neutralized by capture into Rydberg states of Ar and Na and were analyzed by field ionization in an inhomogeneous-field detector whose response over states and energies was carefully mapped. The choice of initially prepared Na states, 24d, 25s, 28d, 29s, 33d, and 34s, allowed a comparison of 1=0 and~2 targets at nearly equal binding energies over a range of reduced velocity u=0. 187 to 1.95. Capture populates m sublevels broadly, not merely m =0. Overlapping contributions from adiabatic and diabatic modes of field ionization were accommodated in the analysis, which used a maximum-entropy-principle parametric form to fit the observed final-state distributions. The peak of the distributions, n, ", shifts upward from a value less than the initial state n, to a value one to three units higher than n, at U between 0.7 and 0.9 and ultimately shifts downward below n; as 0 is further increased. The distributions become significantly sharper where the maximum upward shift occurs. Two ratios were defined to express the widths of fina-state distributions in relative terms, one measuring the spread of orbital kinetic energy and the other the spread of Bohr-orbit velocity. By these ratios a universal behavior over energies, states, and projectile species is observed, and small differences between l =0 and~2 targets may be seen. A theoretical understanding of the present results, which span velocities where both molecular and perturbative theories are normally used, will require a quantal formulation that models the free-ranging response that is a hallmark of the high-quantum-number lim-it.

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Studies of high charge state Rydberg ions

Cited by 3 publications

References 2 publications

Untitled

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Field-ionizing lens system for the detection of high Rydberg states in multicharged ions of keV energies

Projectilendistributions following charge transfer ofAr+andNa+
MacAdam
¹
,
Gray
²
,
Rolfes
³

1990
Phys. Rev. A
39
0
4
0
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Studies of high charge state Rydberg ions

Cited by 3 publications

References 2 publications

Untitled

Untitled

Field-ionizing lens system for the detection of high Rydberg states in multicharged ions of keV energies

Projectilendistributions following charge transfer ofAr+andNa+MacAdam1, Gray2, Rolfes3 1990Phys. Rev. A39040View full textAdd to dashboardCite

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Projectilendistributions following charge transfer ofAr+andNa+
MacAdam
¹
,
Gray
²
,
Rolfes
³

1990
Phys. Rev. A
39
0
4
0
View full text Add to dashboard Cite