Cesium Rydberg-state ionization study by three-dimensional ion-electron correlation: Toward a monochromatic electron source - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Physical Review A Année : 2021

Cesium Rydberg-state ionization study by three-dimensional ion-electron correlation: Toward a monochromatic electron source

R. Hahn
A. Trimeche
C. Lopez
  • Fonction : Auteur
Daniel Comparat
Y. J Picard

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) by three-dimensional (3D) ion-electron coincidence spectroscopy. Cesium atoms are produced by an effusive oven and excited with lasers to Starkshifted Rydberg states or directly ionized. Using a double time-of-flight setup we record 3D (X , Y , time of flight) coincidence imaging of electrons and ions. Above-threshold photoionization creates broad images with poor electron-ion spatial correlation. Fast ionizing states produce very good correlations and the images reveal the electric-field map of the ionization region. Slow ionizing 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. Agreement between our spectroscopic experiment and LFT theory is very good, with better that hundreds of megahertz accuracy. But, on rare particular states, several gigahertz discrepancy is found. This 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.
Fichier principal
Vignette du fichier
2021 Cesium Rydberg-state ionization study by three-dimensional ion-electron correlation Toward a monochromatic electron source Hahn Picard PRA.pdf (2.52 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte

Dates et versions

hal-03369935 , version 1 (07-10-2021)

Identifiants

Citer

R. Hahn, A. Trimeche, C. Lopez, Daniel Comparat, Y. J Picard. Cesium Rydberg-state ionization study by three-dimensional ion-electron correlation: Toward a monochromatic electron source. Physical Review A, 2021, 103 (4), ⟨10.1103/physreva.103.042821⟩. ⟨hal-03369935⟩
45 Consultations
72 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More