State-selective study of the direct double photoionization of the Ne valence shell

Schartner, K.‐H.; Mentzel, G.; Magel, B.; Möbus, B.; Ehresmann, A.; Vollweiler, F.; Schmoranzer, H.

doi:10.1088/0953-4075/26/15/003

Cited by 18 publications

(22 citation statements)

References 20 publications

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“…In atomic DPI an almost linear excess energy dependence of the cross section is typical close to threshold if it is supposed that the Wannier threshold law is valid (Wannier 1953, DPI cross section proportional to E 1.056 exc ). Also in atomic DPI the exciting-photon energy dependence close to threshold shows no remarkable step at the threshold energy in some rare gases (Möbus et al 1994, Schartner et al 1993 which is similar to the exciting-photon energy dependence close to threshold seen in figures 3 and 4 for the present molecular case. Besnard et al (1986Besnard et al ( , 1988 presented a similar behaviour of molecular DPI in NO.…”

Section: Molecular Double Photoionization Into the Nsupporting

confidence: 83%

Dissociative single and double photoionization with excitation between 37 and 69 eV in N₂

Ehresmann

Machida

Kitajima

et al. 2000

J. Phys. B: At. Mol. Opt. Phys.

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Dissociative single and double photoionization of N 2 as a function of the excitingphoton energy has been investigated using monochromatized synchrotron radiation in the excitingphoton energy range between 37 and 69 eV by dispersed VUV fluorescence spectroscopy (80 nm λ fl 200 nm). Relative partial emission cross sections for N I and N II fluorescence have been recorded as a function of the exciting-photon energy. There is strong evidence that the precursors of dissociative single ionization with one of the fragments being excited are the N + 2 2σ −1 g 2 + g state with its closely lying correlation states only. An approximately linear excess energy dependence of the cross sections for the molecular double photoionization into the N 2+ 2 D 1 + u state has been observed in the excitation spectrum of D 1 + u → X 1 + g fluorescence in N 2+ 2 close to its threshold. Evidence for dissociative double photoionization with excitation has been found.

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Section: Molecular Double Photoionization Into the Nsupporting

confidence: 83%

Dissociative single and double photoionization with excitation between 37 and 69 eV in N₂

Ehresmann

Machida

Kitajima

et al. 2000

J. Phys. B: At. Mol. Opt. Phys.

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“…Most recently, DPI has been extensively studied in the outer shell of the rare gases [10 -18], owing to the increased performance of synchrotron radiation (SR) sources. In the measurements of the energy dependence of the branching ratio between double and single photoionization cross sections, considerable attention was given to the threshold [10][11][12] and high energy [13 -15] behaviors of DPI. Some data have also been obtained in the study [16 -18] of the energy and angle-resolved DPI process.…”

mentioning

confidence: 99%

Direct Double Photoionization Involving Inner and Outer Electrons: First Experimental Determination and Many-Body Calculations of an Absolute Cross Section

et al. 1994

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Using synchrotron radiation, we have determined the absolute cross section for double photoionization involving the 2p and 3s electrons in atomic sodium. %e have also calculated this cross section in the many-body perturbation theory approximation.Our experimental and theoretical results are in good agreement one with each other and represents the first absolute determination of a double photoionization cross section in the case where the two electrons belong to two different shells.PACS numbers: 32.80. Hd, 32.80.Fb In this Letter, we present the results of the first experimental determination of an absolute double photoionization cross section for the direct emission into the continuum of two electrons belonging to two different shells. These measurements were performed for simultaneous photoionization of 2p and 3s electrons in sodium atoms. We also present calculations of the double photoionization cross section of Na (2p3s kik2) for photon energy from 50 to 250 eV, using many-body perturbation theory (MBPT).Double photoionization (DPI) in the outer shell of atoms has long attracted considerable interest, because it provides a sensitive test for the importance of electronelectron correlation effects. Earlier work on the rare gases [1 -4] revealed that the shakeoff theory, describing DPI as the result of monopole transitions resulting from relaxation of the hole state produced in the outer shell, was unable to account for most of the DPI intensity. MBPT was used at that time to calculate DPI cross sections in neon [5 -7], helium [8], and argon [7]. Agreement with the first experimental data available was reasonably good, especially for helium [9]. Most recently, DPI has been extensively studied in the outer shell of the rare gases [10 -18], owing to the increased performance of synchrotron radiation (SR) sources. In the measurements of the energy dependence of the branching ratio between double and single photoionization cross sections, considerable attention was given to the threshold [10-12] and high energy [13 -15] behaviors of DPI. Some data have also been obtained in the study [16 -18] of the energy and angle-resolved DPI process. Parallel to this experimental activity, progress has also been made in theoretical calculations of DPI cross section for helium [19 -22] and for argon [23].When the primary vacancy is produced in an inner atomic subshell, doubly charged ions can result from two different mechanisms.In the one-step DPI, a second electron is simultaneously ejected from the outer shell via correlation effects, namely [5 -8] core relaxation (CR), ground state correlations (GSC), and inelastic scattering (IS) of the photoelectron in collision with outer shell electrons while leaving the atom. CR and IS can be grouped into the category of final state correlations (FSC), although such a classification should be considered with some caution, as it has been shown that it is gauge dependent [19]. In the two-step process [24], the ejection of the first electron is followed by Auger decay of the singly c...

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“…2), which is clearly observed in the 4p 4 1 D distribution but is very weak in the 3 P and 1 S distributions. Peaks at similar energies do, however, also appear in the electron distributions related to the 4s4p 5 final states (not shown).…”

Section: B Double-ionization Processesmentioning

confidence: 91%

“…In the distribution for the 1 D state, some sharp peaks are also observed for the 40-42 eV binding-energy range, but detailed analysis suggests that they should be attributed rather to the 3 P state, and appear here due to the imperfect final-state selection. The 4s4p 5 np states have been studied extensively in the spectator Auger decay of the 3d −1 np optical resonances [15,[29][30][31], and approximate positions are indicated in Fig. 4.…”

Section: B Double-ionization Processesmentioning

confidence: 99%

“…Double photoionization (DPI) leading to higher excited states of the dications, e.g., with a vacancy in the outermost s subshell, has received comparatively less attention. So far, neon has been thoroughly explored and the cross section for the formation of states related to the 2s 1 2p 5 and 2s 0 2p 6 configurations has been determined by both optical spectroscopy [5] and electron-electron coincidence spectroscopy [6]. Threshold photoelectron coincidence (TPEsCO) [7] studies have been carried out for photon energies covering the entire region below the core levels in neon and argon [8], as well as in xenon [9].…”

Section: Introductionmentioning

confidence: 99%

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Complete double valence photoionization study of the electron spectra of krypton

et al. 2013

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State-selective study of the direct double photoionization of the Ne valence shell

Cited by 18 publications

References 20 publications

Dissociative single and double photoionization with excitation between 37 and 69 eV in N₂

Dissociative single and double photoionization with excitation between 37 and 69 eV in N₂

Direct Double Photoionization Involving Inner and Outer Electrons: First Experimental Determination and Many-Body Calculations of an Absolute Cross Section

Complete double valence photoionization study of the electron spectra of krypton

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State-selective study of the direct double photoionization of the Ne valence shell

Cited by 18 publications

References 20 publications

Dissociative single and double photoionization with excitation between 37 and 69 eV in N2

Dissociative single and double photoionization with excitation between 37 and 69 eV in N2

Direct Double Photoionization Involving Inner and Outer Electrons: First Experimental Determination and Many-Body Calculations of an Absolute Cross Section

Complete double valence photoionization study of the electron spectra of krypton

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Dissociative single and double photoionization with excitation between 37 and 69 eV in N₂

Dissociative single and double photoionization with excitation between 37 and 69 eV in N₂