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Title: Half-cycle pulse ionization of Ba{sup +} Rydberg ions

Abstract

Nearly unipolar, subpicosecond half-cycle pulses (HCPs) have been used to ionize Ba{sup +} ng Rydberg ions. The double ionization probability vs HCP field strength data are compared with analogous single ionization measurements for neutral Ba 6snd Rydberg atoms prepared in the same apparatus. We find that neutral and ionic Rydberg states with the same binding energies follow approximately the same ionization curves. Our findings are in agreement with the predictions of an impulsive ionization model and classical trajectory Monte Carlo simulations.

Authors:
;  [1]
  1. Department of Physics, University of Virginia, Charlottesville, Virginia 22904-4714 (United States)
Publication Date:
OSTI Identifier:
20787018
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. A; Journal Volume: 73; Journal Issue: 3; Other Information: DOI: 10.1103/PhysRevA.73.035401; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; ATOMS; BARIUM; BARIUM IONS; BINDING ENERGY; CATIONS; COMPUTERIZED SIMULATION; MONTE CARLO METHOD; PHOTOIONIZATION; PHOTON-ATOM COLLISIONS; PROBABILITY; PULSES; RYDBERG STATES

Citation Formats

Zhang, X., and Jones, R. R. Half-cycle pulse ionization of Ba{sup +} Rydberg ions. United States: N. p., 2006. Web. doi:10.1103/PHYSREVA.73.0.
Zhang, X., & Jones, R. R. Half-cycle pulse ionization of Ba{sup +} Rydberg ions. United States. doi:10.1103/PHYSREVA.73.0.
Zhang, X., and Jones, R. R. Wed . "Half-cycle pulse ionization of Ba{sup +} Rydberg ions". United States. doi:10.1103/PHYSREVA.73.0.
@article{osti_20787018,
title = {Half-cycle pulse ionization of Ba{sup +} Rydberg ions},
author = {Zhang, X. and Jones, R. R.},
abstractNote = {Nearly unipolar, subpicosecond half-cycle pulses (HCPs) have been used to ionize Ba{sup +} ng Rydberg ions. The double ionization probability vs HCP field strength data are compared with analogous single ionization measurements for neutral Ba 6snd Rydberg atoms prepared in the same apparatus. We find that neutral and ionic Rydberg states with the same binding energies follow approximately the same ionization curves. Our findings are in agreement with the predictions of an impulsive ionization model and classical trajectory Monte Carlo simulations.},
doi = {10.1103/PHYSREVA.73.0},
journal = {Physical Review. A},
number = 3,
volume = 73,
place = {United States},
year = {Wed Mar 15 00:00:00 EST 2006},
month = {Wed Mar 15 00:00:00 EST 2006}
}
  • We have calculated, by numerically integrating the time-dependent Schroedinger equation, the probability for ionization of a hydrogen atom from a high Rydberg state by a half-cycle pulse whose duration is comparable to, or shorter than, the period of the Rydberg orbit. We have chosen a pulse whose parameters are the same as the pulse used in the experiment of R. R. Jones, D. You, and P. H. Bucksbaum [Phys. Rev. Lett. 70, 1236 (1993)]. We compare our results with the classical results and with the experimental data of Jones [ital et] [ital al]., and we also present results for energymore » and angular distributions. Finally, we derive an approximate conservation law which applies in the limit of very short pulse times.« less
  • The ionization of potassium Rydberg atoms with {ital n}{approximately}388 and {ital n}{approximately}520 by pulsed electric fields whose durations, which range from {approximately}2 to {approximately}110 ns, span the transition from the short-pulse to the long-pulse regime is investigated experimentally and the data compared with the results of classical trajectory Monte Carlo calculations. We observe excellent agreement between theory and experiment providing a benchmark test for the validity of the classical limit of ionization. Very-high-{ital n} atoms provide an excellent tool with which to probe the response of atoms to pulsed electric fields in the short-pulse regime. {copyright} {ital 1996 The Americanmore » Physical Society.}« less
  • The influence of the half-cycle pulse (HCP) kick on the asymptotic velocity of the ejected electron has been studied for excited xenon atoms (n{sup *}=34) in the presence of a static electric field (220 V cm{sup -1}). We find that the HCP does not change the momentum distribution perpendicular to the kick direction. Therefore half-cycle pulse ionization and electron velocity map imaging can be used to obtain two-dimensional momentum distributions of atomic Rydberg states. Semiclassical and quantum mechanical calculations complement the experimental results.
  • The final-state distribution of hydrogen, acted upon by a 1/2-cycle pulse, has been calculated semiclassically for a proposed one-dimensional experiment. This work was motivated by the recent experimental realization of half-cycle pulses by Jones, You, and Bucksbaum [Phys. Rev. Lett. 70, 1236 (1993)] in which preliminary studies of ionization and state redistribution for hydrogenlike atoms were carried out. To simplify the situation theoretically, an experiment is proposed in which an additional weak static electric field is imposed and approximately one-dimensional states are selected. Within this one-dimensional approximation the transition probability to various [ital n] states ([ital n] is the principalmore » quantum number) has been calculated as a function of the amplitude of the half-cycle pulse, using a semiclassical formula due to Miller [Adv. Chem. Phys. 25, 69 (1974)]. A complete derivation of this formula and a discussion of approximations are made in the following paper. We have found that an even number of trajectories always contributes to the transition probability and leads to observable interference effects. In addition, we find that bifurcations of these trajectories can occur, resulting in resonances and more complicated interference structures.« less
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