Autoionization selectivity of Ne+ Rydberg states converging to Ne2+ (1Se) (original) (raw)
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Photoelectron ionization spectra of an autoionization system with one discrete level interacting with a neighbor two-level atom are discussed. The formula for long-time ionization spectra is derived. According to this formula, the spectra can be composed of up to eight peaks. Moreover, the Fano-like zeros for weak optical pumping have been identified in these spectra. The conditional ionization spectra depending on the state of the neighbor atom exhibit oscillations at the Rabi frequency. Dynamical spectral zeros occurring once per the Rabi period have been revealed in these spectra.
Spectroscopy of autoionizing states contributing to electron-impact ionization of ions
Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms, 1989
In electron-ion crossed-beam experiments we have used a fast electron-energy scanning technique to detect fine details in ionization cross sections. We obtained data with a relative point to point uncertainty of less than 0.1%. The electron energy spread at 100 eV (15 mA beam current) is 0.4 eV. Thus we were able to measure state-resolved excitation-autoionization contributions and to demonstrate
Photoelectron recapture as a tool for the spectroscopy of ionic Rydberg states
Physical Review A, 2004
We use recapture of near-threshold photoelectrons by post-collision interaction with Auger electrons as an effective method for population of the high Rydberg states of sub-valence ionized Ne ions. The subsequent intermultiplet Auger transitions are detected by high-resolution electron spectrometry. The series of transitions 2p 4 ( 1 D)np 2 D, 2 F → 2p 4 3 P up to n = 20 are observed and identified with the help of the MCDF ab initio calculations.
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Using high-precision wave functions describing the ground and excited states of the H Ϫ ion, He atom, and heliumlike ions, the cross sections of single-and double-electron photoionization are calculated. The dependence of the ratio R of the double-and single-ionization cross sections on the nuclear charge Z and the principal quantum number of excitation n is studied and compared with the predictions of the high-Z expansion and the high-n shake-off mechanisms.
Complete Two-Electron Spectra in Double Photoionization: The Rare Gases Ar, Kr, and Xe
Physical Review Letters, 2003
A new spectroscopic technique, giving complete two-dimensional e ÿ -e ÿ coincidence spectra in single photon double photoionization, is presented. The technique resolves the states of doubly charged ions and provides spectra of the individual electrons emitted in formation of each final dication state. Complete spectra for double photoionization of Xe, Kr, and Ar at photon energies up to 51 eV have been recorded. Overall and surprisingly, the np 4 3 P, 1 D, and 1 S states are populated according to their statistical weights. When the evident autoionization is excluded, the supposedly favored 3 P states are in fact disfavored. Detailed information on the autoionization processes is also made available.
Photoelectron ionization spectra in a system interacting with a neighbor atom
Journal of Russian Laser Research, 2011
Photoelectron ionization spectra of a system interacting with a neighbor two-level atom are investigated using the Laplace-transform method. These spectra are typically composed of several peaks. Photoelectron ionization spectra conditioned by the measurement on the two-level atom show oscillations at the Rabi frequency. The presence of spectral zeros occurring periodically with the Rabi period is predicted. This phenomenon is analyzed in detail.
Photoionization electron spectra in a system interacting with a neighboring atom
Physical Review A, 2011
Photoelectron ionization spectra of a system interacting with a neighbor two-level atom are investigated using the Laplace-transform method. These spectra are typically composed of several peaks. Photoelectron ionization spectra conditioned by the measurement on the two-level atom show oscillations at the Rabi frequency. The presence of spectral zeros occurring periodically with the Rabi period is predicted. This phenomenon is analyzed in detail.
Photoionization of Ne^{+} using synchrotron radiation
Physical Review A, 2002
Absolute measurements of cross sections for photoionization of a statistical admixture of Ne ϩ in the 2 P 3/2 o ground state and the 2 P 1/2 o metastable state are reported in the energy range 40-71 eV at photon energy resolutions ranging from 22 meV to 2 meV. The experiments were performed using synchrotron radiation from an undulator beamline of the Advanced Light Source with a newly developed ion-photon-beam endstation. The data are characterized by multiple Rydberg series of autoionizing resonances superimposed upon a direct photoionization background cross section where some of the observed resonance line shapes show evidence of interference between the direct and indirect photoionization channels. The resonance features are assigned spectroscopically, and their energies and quantum defects are tabulated. The experimental photoionization cross sections are in satisfactory agreement with the predictions from theoretical calculations performed in intermediate coupling using the semirelativistic Breit-Pauli approximation with ten states. The resonances nearest to the ionization thresholds exhibit anomalous behavior with respect to their positions and strengths due to the presence of interloping resonances associated with higher-lying ionic states causing disruption of the regular Rydberg spectral pattern.
Chemical Physics Letters, 1999
Photo-double ionization of DCl has been investigated in the 35.5-38 eV energy range using synchrotron radiation on Ž. beamline 10.0.1.2 of the Advanced Light Source by the threshold photoelectron s coincidence TPE sCO method. The Ž 3 y. Ž 1. 2q TPE sCO spectrum of DCl, encompassing the formation of the ground X S and first-excited a D states of DCl , was Ž. recorded at good resolution ; 13 meV using a pair of penetrating-field electron spectrometers. Four vibrational bands were Ž. identified in both electronic-state systems. In addition, the threshold photoelectron TPE spectrum of DCl for the formation of singly-charged DCl was recorded simultaneously in the same energy range. Indirect resonance autoionization of Rydberg Ž 3 y. 2q Ž 1. ion states appears to play a substantial role in the formation of the X S state of DCl while the a D state appears to be formed primarily by direct photo-double ionization.