# Cold atomic collisions: coherent control of penning and associative ionization.

@article{Arango2006ColdAC,
title={Cold atomic collisions: coherent control of penning and associative ionization.},
author={Carlos A. Arango and Moshe Shapiro and Paul Brumer},
journal={Physical review letters},
year={2006},
volume={97 19},
pages={
193202
}
}
• Published 17 October 2006
• Physics
• Physical review letters
Coherent control techniques are computationally applied to cold (1 mK<T<1 K) and ultracold (T<1 muK) Ne*(3s,3P2)+Ar(1S0) collisions. We show that by using various initial superpositions of the Ne*(3s,3P2) M={-2,-1,0,1,2} Zeeman sublevels it is possible to reduce the Penning ionization and associative ionization cross sections by as much as 4 orders of magnitude. It is also possible to drastically change the ratio of these two processes. The results are based on combining, within the "rotating…

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## References

SHOWING 1-10 OF 29 REFERENCES

### Molecular-beam studies of Penning ionization

Molecular-beam experiments have exposed a new wealth of detail on the general reaction ${A}^{*}+B\ensuremath{\rightarrow}A+{B}^{+}+{e}^{\ensuremath{-}}$ first suggested by Penning in 1927. The new

### Population of fine-structure levels of Ar+(2P3/2,1/2) in Penning ionisation of Ar by metastable Ne*

A recently published experimental study on the Penning ionisation of Ar by metastable Ne*(3P2) atoms shows non-statistical population of the fine-structure levels of the argon ions. The authors

### Molecular Autoionization Lifetimes and Cross Sections for Penning Ionization: Numerical Results for He* (1s2s 3S) + H(1s 2S)

• Physics
• 1972
The width Γ (or lifetime ℏ/Γ) for autoionization of He* (1s2s 3S) + H(1s2S) has been calculated as a function of internuclear distance, and cross sections for Penning and associative ionization

### Model quantum-mechanical calculations for the Penning ionization of Ar by He(23S)

• Physics
• 1976
Using model potential curves V*, Gamma and V+, quantum-mechanical calculations are carried out for the scattering of He(23S) and Ar in the energy range 20-180 meV. Certain simplifying approximations

### High-brightness atom source for atomic fountains

• Physics
• 2001
We launch Cs atoms using a moving three-dimensional (3D) optical lattice. Atoms are initially spin polarized and cooled to the ground state of the optical potential using 3D Raman sideband cooling

### Ionization widths for Ne(3l)-Ar systems (l=s,p) : application to ionization and intramultiplet mixing cross sections

• Physics
• 1997
{ital Ab initio} autoionization widths for the Ne(3s)-Ar and Ne(3p)-Ar systems are calculated in a two-electron approximation. Using correctly normalized wave functions, the calculations result in

### Complex potential and electron spectrum in atomic collisions involving fast electronic transitions: Penning and associative ionization

Beginning with a Feshbach projection-operator analysis, formulas for the local complex potential in the entrance-channel radial wave equation are reviewed and developed in detail for inelastic

### Coherent population transfer among quantum states of atoms and molecules

• Physics
• 1998
The authors discuss the technique of stimulated Raman adiabatic passage (STIRAP), a method of using partially overlapping pulses (from pump and Stokes lasers) to produce complete population transfer