Resonance structure in the neon photoelectron satellites

Wills, A A; Cafolla, A.A.; Svensson, Agneta; Comer, John

doi:10.1088/0953-4075/23/12/012

Cited by 48 publications

(35 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In a photoelectron spectroscopy experiment [64], it is difficult to distinguish the (Ne + )*2p 4 ( 3 P)3p( 4 P) satellite from the (Ne + )*2p 4 ( 1 D)3s( 2 D) satellite since the two states differ in energy by only a few millielectron volts. Fluorescence spectroscopy, however, permits one to distinguish the 4 P satellite by its fluorescence in the wavelength range 3665-3778 Å, i.e., (Ne + )*2p 4 ( 3 P)3p( 4 P J ) ® (Ne + )*2p 4 ( 3 P)3s( 4 P J′ ) + γ′ (20) where the wavelength range arises from transitions between the various allowed J and J' levels.…”

Section: Fluorescence Spectroscopymentioning

confidence: 99%

“…In contrast, the (Ne + )*2p 4 ( 1 D)3s( 2 D) satellite fluoresces in the neighborhood of 406 Å. A comparison of the photoelectron [64] and fluorescence [63] spectra is shown in Figure 8. The bottom panel shows the fluorescence spectrum [63]-see process (20)-as a function of the incident photon energy-see process (18).…”

Section: Fluorescence Spectroscopymentioning

confidence: 99%

“…The bottom panel shows the fluorescence spectrum [63]-see process (20)-as a function of the incident photon energy-see process (18). The top panel shows the corresponding photoelectron spectroscopy (PES) spectrum [64], which cannot distinguish between the 3p( 4 P) and 3s( 2 D) satellites. It is plotted also versus incident photon energy.…”

Section: Fluorescence Spectroscopymentioning

confidence: 99%

See 2 more Smart Citations

Fundamental Aspects of Atomic Photoionization with High-Brightness Light Sources

Starace

Manson

1996

VUV and Soft X-Ray Photoionization

View full text Add to dashboard Cite

Section: Fluorescence Spectroscopymentioning

confidence: 99%

Section: Fluorescence Spectroscopymentioning

confidence: 99%

Section: Fluorescence Spectroscopymentioning

confidence: 99%

See 1 more Smart Citation

Fundamental Aspects of Atomic Photoionization with High-Brightness Light Sources

Starace

Manson

1996

VUV and Soft X-Ray Photoionization

View full text Add to dashboard Cite

“…Early photoabsorption results demonstrated departure from LScoupling predictions (i.e., the neglect of spin-orbit effects), by observing the fine-structure splittings of the 2p 4 ͑ 3 P͒3s͑ 2 P 1͞2,3͞2 ͒nl resonances [2]. Later measurements [3][4][5] were able to observe additional spin-orbit effects by detecting resonance contributions in the photoionization excitation to quartet ionic states, which is a forbidden process in LS coupling. More recently, the fine-structure splitting of resonance series was observed in greater detail [6] than was possible in the earlier studies [2].…”

mentioning

confidence: 99%

Importance of Spin-Orbit Effects in Parity-Unfavored Photoionization of Neon, Observed Using a Two-Dimensional Photoelectron Imaging Technique

et al. 1998

View full text Add to dashboard Cite

We present an experimental and theoretical study of photoexcitation and decay mechanisms of doubly excited resonances in neon. New spin-orbit induced effects are identified in the angleresolved and photoelectron-resolved differential cross sections for a parity-unfavored transition. These observations are facilitated using a two-dimensional imaging technique, and highlight the importance of considering spin-orbit induced effects when studying detailed spectra in atomic systems as light as neon.[S0031-9007(98)06291-7] PACS numbers: 32.80.Fb, 31.50. + w, 32.80.Dz The simultaneous excitation of two atomic electrons by a single photon has been the subject of numerous experimental and theoretical investigations. These intermediate resonance states reveal higher-order, interelectron correlation effects, and provide a more stringent testing ground for the accuracy of existing theoretical and computational methods. Helium, due to its relative simplicity, has been studied extensively [1]. The case of neon, however, is more complicated than helium due to the occupied 2p subshell, which leads to a dense grouping of the Ne 1 2p 4 nl states and hence more complex resonances. Nevertheless, many studies have been performed on this system as well, and some have observed spin-orbit effects. Early photoabsorption results demonstrated departure from LScoupling predictions (i.e., the neglect of spin-orbit effects), by observing the fine-structure splittings of the 2p 4 ͑ 3 P͒3s͑ 2 P 1͞2,3͞2 ͒nl resonances [2]. Later measurements [3][4][5] were able to observe additional spin-orbit effects by detecting resonance contributions in the photoionization excitation to quartet ionic states, which is a forbidden process in LS coupling. More recently, the fine-structure splitting of resonance series was observed in greater detail [6] than was possible in the earlier studies [2]. These results established the existence of certain spin-orbit effects in the photoionization of neon, but they lacked additional information provided by highly differential measurements. Furthermore, in the earlier cases, only small spin-orbit corrections were observed.The purpose of the present Letter is to demonstrate that for certain neon resonances, the angular distribution of photoelectrons and the ratio of partial cross sections to individual fine-structure levels both exhibit behavior that deviates markedly from LS-coupling predictions. Such observations provide further quantitative determination of the breakdown of LS coupling. Particular attention will be given to the 2p 4 3pns, nd doubly excited resonances in photoionization excitation to the Ne 1 2p 4 ͑ 3 P͒3s͑ 2 P͒ state. These findings were achieved using high-resolution measurements of photoionization cross sections that are differential in photon energy, photoelectron energy, and photoelectron angle.The 2p 4 3pns, nd resonances are particularly strong because the ϳ10% mixing of the 2p 5 3p configuration in the 2p 6 ground state leads to the one-electron photoexcitation 2p 5 3p ! 2p 4 3pns, nd [6]. Br...

show abstract

“…Angle-resolved and level-resolved measurements have provided an insight into such spin-orbit effects. For this measurement, the photon energy resolution was set to 20 meV, which is a significant improvement over the previous resolution of 100 meV in earlier differential measurements [19].…”

Section: Spin-orbit Effects In Parity Unfavored Photoionization Of Neonmentioning

confidence: 99%

Angle-resolved 2D imaging of electron emission processes in atoms and molecules

Kukk

Wills²,

Langer

et al. 1998

Atomic Processes in Plasmas

View full text Add to dashboard Cite

Abstract. A variety of electron emission processes have been studied in detail for both atomic and molecular systems, using a highly efficient experimental system comprising two time-of-flight (TOF) rotatable electron energy analyzers and a 3rd generation synchrotron light source. Two examples are used here to illustrate the obtained results. Firstly, electron emission in the HCl molecule have been mapped over a 14 eV wide photon energy range over the C1 2p ionization thresholds. Particular attention is paid to the dissociative coreexcited states, for which the Auger electron emission shows photon energy dependent features. Also, the evolution of resonant Auger to the normal Auger decay distorted by post collision interaction has been observed and the resonating beahavior of the valence photoelectron lines studied. Secondly, an atomic system, neon, in which excitation of doubly excited states and their subsequent decay to various accessible ionic states has been studied. Since these processes only occurs via inter-electron correlations, the many body dynamics of an atom can be probed, revealing relativistic effects, surprising in such a light atom. Angular distribution of the decay of the resonances to the parity-unfavored continuum exhibits significant deviation from the LS coupling predicitons.

show abstract

Resonance structure in the neon photoelectron satellites

Cited by 48 publications

References 24 publications

Fundamental Aspects of Atomic Photoionization with High-Brightness Light Sources

Fundamental Aspects of Atomic Photoionization with High-Brightness Light Sources

Importance of Spin-Orbit Effects in Parity-Unfavored Photoionization of Neon, Observed Using a Two-Dimensional Photoelectron Imaging Technique

Angle-resolved 2D imaging of electron emission processes in atoms and molecules

Contact Info

Product

Resources

About