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Pré-Publication, Document De Travail Année : 2020

Cesium Rydberg states ionization study by 3-D ion-electron correlation

R Hahn
A. Trimeche
D. Comparat

Résumé

We study the excitation and ionization of cesium Rydberg states in an electric field (∼ 2200 V/cm) near the classical field ionization threshold (∼ −280 cm −1 binding energy at this field) by 3-D ionelectron coincidence spectroscopy. Cesium atoms are produced by an effusive oven and excited with lasers to Stark-shifted Rydberg states or directly ionised. Using a double Time of Flight setup we record 3-D (X, Y, Time of Flight) coincidence imaging of cesium produced electrons and ions. Above-threshold photo-ionisation creates broad images with poor electron/ion-coordinates correlation. Depending on the coupling of particular Rydberg states to the continuum, various images and correlations are observed. Fast ionising states show very good correlations and reveal the electric field lines, creating an efficient electric field mapping of the ionisation region. Slow ionising states show that the relatively high atomic velocity is detrimental to the correlations. Experimental data are accurately reproduced by detailed Monte Carlo excitation and ionization simulations based on Stark maps obtained with local-frame transformation (LFT) theory. Spectroscopic LFT agreement is usually very good with better that hundreds of MHz accuracy but on particular states several GHz discrepancy is found. The study can be used to select appropriate states for the creation of ion and electron beams with high brightness, good correlation and low energy dispersion, as well as to provide a detailed analysis of LFT-theory shortcomings.
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Dates et versions

hal-03017763 , version 1 (23-11-2020)

Identifiants

  • HAL Id : hal-03017763 , version 1

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R Hahn, A. Trimeche, C. Lopez, D. Comparat, Y. J. Picard. Cesium Rydberg states ionization study by 3-D ion-electron correlation. 2020. ⟨hal-03017763⟩
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