Electron capture from a directed Stark-Rydberg state: Fore-and-aft ratios

Homan, Dean; Makarov, O. P.; Sorokina, O. P.; MacAdam, K. B.; Lundsgaard, Morten; Lin, C. D.; Toshima, Naoki

doi:10.1103/physreva.58.4565

Cited by 11 publications

(18 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Extensive studies of electron capture from atoms excited to specific aligned or oriented quantum states of low angular momentum quantum numbers have already given important new insights [3][4][5], but the geometrical control of the initial state is stronger with CES for which not only the orientation in space but also the shape of the electron cloud is a continuous variable. Experimental results on electron capture from CES may thus contribute to a better understanding of the relative importance for the capture process of the spatial and the momentum distributions of the initial state [6][7][8][9][10]. § Author to whom correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Electron capture from elliptic Rydberg states: impact perpendicular to the minor axis

Kristensen¹,

Bové²,

DePaola³

et al. 2000

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

View full text Add to dashboard Cite

The total cross section, σ , for electron capture by Na + ions from oriented coherent elliptic states (CES) of Li with principal quantum number n = 25 was studied experimentally for impact perpendicular to the minor axis of the elliptic orbit. The remaining geometrical parameters of the CES, which are the eccentricity, e, and the angle, ϕ, between the major axis and the beam direction, were varied in the course of the experiments, as was the reduced impact velocity v r = nv, where v is the projectile velocity in atomic units. Several representative cuts were chosen within the parameter space (v r , e, ϕ) = (0.74-2.09, 0-1, 0-2π ). The velocity range includes the region of matching velocities (v r 1) where σ for given geometrical parameters attains its maximum value and the high-velocity region where σ is a strongly decreasing function of v r . The cross section depends sensitively on each geometrical parameter, and the dependences change dramatically as v r is varied. The spatial distribution of the CES apparently governs σ in some region of parameter space (v r , e, ϕ) and in another the momentum distribution prevails.

show abstract

Section: Introductionmentioning

confidence: 99%

Electron capture from elliptic Rydberg states: impact perpendicular to the minor axis

Kristensen¹,

Bové²,

DePaola³

et al. 2000

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

View full text Add to dashboard Cite

show abstract

“…Figure 4(a) shows the extremely large charge exchange cross sections as a function of the p energy for 20 V=cm F i 60 V=cm. The inset shows cx in units of a 2 0 , where a 0 is the Bohr radius, as a function of the relative collision velocity scaled by the average axial positron velocity v z hv 2 z i q of the target H. Pronounced ''humps'' in the cross sections occur when the Rydberg e and p velocities match [17].…”

mentioning

confidence: 97%

New Interpretations of Measured Antihydrogen Velocities and Field Ionization Spectra

2006

View full text Add to dashboard Cite

We present extensive Monte Carlo simulations, showing that cold antihydrogen (H) atoms are produced when antiprotons (p) are gently heated in the side wells of a nested Penning trap. The observed H with high energies, that had seemed to indicate otherwise, are instead explained by a surprisingly effective charge-exchange mechanism. We shed light on the previously measured field-ionization spectrum, and reproduce both the characteristic low-field power law as well as the enhanced H production at higher fields. The latter feature is shown to arise from H toms too deeply bound to be described as guiding center atoms, atoms with internally chaotic motion.

show abstract

“…As expected, the cross sections are very large and quickly drop as the relative collision velocity increases. The cross section maxima are due to a matching of Rydberg e + andp velocities [19].…”

Section: Rydberg Charge Exchange Cross Sectionmentioning

confidence: 98%

“…The Rydberg charge-exchange [19] in a magnetic field has received only little attention. Bradenbrink et al [20] studied the electron transfer from Rydberg atoms in collision with singly-charged ions in a laboratory magnetic field.…”

Section: Rydberg Charge Exchange Cross Sectionmentioning

confidence: 99%

Formation of Antihydrogen Rydberg atoms in strong magnetic field traps

Pohl¹,

Sadeghpour²,

Kanai³

et al. 2008

AIP Conference Proceedings

View full text Add to dashboard Cite

It is shown that several features of antihydrogen production in nested Penning traps can be described with accurate and efficient Monte Carlo simulations. It is found that cold deeply-bound Rydberg states of antihydrogen (H) are produced in three-body capture in the ATRAP experiments and an additional formation mechanism-Rydberg charge transfer-, particular to the nested Penning trap geometry, is responsible for the observed fast (hot)H atoms. Detailed description of the numerical propagation technique for following extreme close encounters is given. An analytic derivation of the power law behavior of the field ionization spectrum is provided.

show abstract

Electron capture from a directed Stark-Rydberg state: Fore-and-aft ratios

Cited by 11 publications

References 32 publications

Electron capture from elliptic Rydberg states: impact perpendicular to the minor axis

Electron capture from elliptic Rydberg states: impact perpendicular to the minor axis

New Interpretations of Measured Antihydrogen Velocities and Field Ionization Spectra

Formation of Antihydrogen Rydberg atoms in strong magnetic field traps

Contact Info

Product

Resources

About