Evidence for atomic processes in molecular valence double ionization

Becker, Uwe; Hemmers, Oliver; Langer, Burkhard; Menzel, A.; Wehlitz, R.; Peatman, W.B.

doi:10.1103/physreva.45.r1295

Cited by 44 publications

(33 citation statements)

References 24 publications

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“…Discrepancies between our experimental spectrum and the calculated density of states in the higher-binding-energy region may be due to satellites or simultaneous double ionization. Above Rcu-30 eV, the double-1onizatlon cross sect1on contr lbutes slgn16cantly to the total cross section [32,33]; the most probable reason, besides simultaneous double ionization, is valence Auger decay [34].…”

Section: Methodsmentioning

confidence: 99%

Angle-resolved photoelectron spectroscopy ofC60

et al. 1995

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Angle-resolved photoelectron spectra of gaseous C60 were recorded in the photon energy regions from 21 to 108 eV and from 295 to 320 eV. Partial cross sections o and the angular distribution anisotropy parameter P vary significantly with photon energy, particularly in the near-threshold region of the valence and the core ionization regimes. Some of these effects may be attributed to scattering of the outgoing photoelectron by the atoms of the ionized C60 molecule. Our results indicate that the observed satellites of the C(1s) main line are most likely of shake-up character. Low-energy electrons emitted below the shake-off threshold indicate the occurrence of K-shell vacancy filling double Auger decay. PACS number(s): 36.40.Mr, 33.80. -b, 33.60. -q

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Section: Methodsmentioning

confidence: 99%

Angle-resolved photoelectron spectroscopy ofC60

et al. 1995

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“…The final states of our resonant Auger process are two-hole one-electron states in the binding energy range of the innervalence states, a region characterized by the breakdown of the molecular orbital picture and dominated by repulsive energy curves. However, despite the predominance of dissociative behavior in these states [18] [20]. In order to examine these states also at their production threshold a comparison is made with a threshold photoelectron spectrum taken in the photon energy region of the corresponding binding energies.…”

Section: Rvmentioning

confidence: 99%

Vibrational-state-dependent decay of the CO C(1s) excitation

et al. 1995

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Molecular ionization and ionic fragmentation of core excited CO valence and Rydberg states are studied by partial-ion-yield spectroscopy at vibrational resolution. The vibrational intensities of the Rydberg excitations differ significantly depending on the ionization and/or fragmentation channel. The observed intensity variations are explained by nondissociative excited final ionic states of the subsequent molecular Auger decay. The vibrational levels of these final states become selectively depopulated due to interaction with dissociative decay channels leading to ionic fragmentation.

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“…Following the detailed investigations of small diatomic molecules in the past as, for example, H 2 [12][13][14], N 2 [5,15,16], CO [17], and O 2 [18][19][20], attention has been turned to more complex systems such as CO 2 [21][22][23][24], H 2 O [25,26], CH 4 [27,28], and C 2 H 2 and C 2 H 4 [29]. A polyatomic molecule can additionally disperse energy between its constituents at conical intersections on the potential energy surfaces (PESs), undergo conformation changes (such as isomerization or twisting), and its fragments can be electronically and vibrationally excited (see, for example, [29][30][31][32][33]).…”

Section: Introductionmentioning

confidence: 99%

Auger decay and subsequent fragmentation pathways of ethylene followingK-shell ionization

et al. 2015

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The fragmentation pathways and dynamics of ethylene molecules after core ionization are explored using coincident measurements of the Auger electron and fragment ions by employing the cold target recoil-ion momentum spectroscopy method. The influence of several factors on the dynamics and kinematics of the dissociation is studied. These include propensity rules, ionization mechanisms, symmetry of the orbitals from which the Auger electrons originate, multiple scattering, conical intersections, interference, and possible core-hole localization for the double ionization of this polyatomic molecule. Energy correlation maps allow probing the multidimensional potential energy surfaces and, in combination with our multiconfiguration self-consistent field calculations, identifying the populated electronic states of the dissociating dication. The measured angular distributions of the Auger electrons in the molecular frame further support and augment these assignments. The deprotonation and molecular hydrogen ion elimination channels show a nearly isotropic Auger electron angular distribution with a small elongation along the direction perpendicular to the molecular axis. For the symmetric breakup the angular distributions show a clear influence of multiple scattering on the outgoing electrons. The lowest kinetic energy release feature of the symmetric breakup channel displays a fingerprint of entangled Auger and photoelectron motion in the angular emission pattern identifying this transition as an excellent candidate to probe core-hole localization at a conical intersection of a polyatomic molecule.

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Evidence for atomic processes in molecular valence double ionization

Cited by 44 publications

References 24 publications

Angle-resolved photoelectron spectroscopy ofC60

Angle-resolved photoelectron spectroscopy ofC60

Vibrational-state-dependent decay of the CO C(1s) excitation

Auger decay and subsequent fragmentation pathways of ethylene followingK-shell ionization

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