Strong Molecular Alignment Dependence of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi mathvariant="bold">H</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>Electron Impact Ionization Dynamics

Ren, Xueguang; Pflüger, Thomas; Xu, Shenyue; Colgan, J.; Pindzola, M. S.; Senftleben, Arne; Ullrich, J.; Dorn, Alexander

doi:10.1103/physrevlett.109.123202

Cited by 44 publications

(30 citation statements)

References 30 publications

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“…For ground-state dissociation, there is only one active target electron and the problem can be treated as a three-body problem. For this case, good agreement between experiment and theory is found for both the M3DW and the time-dependent close-coupling (TDCC) approximations [6,7,[21][22][23][24][25][26][27]. In the second type of experiment, the residual target electron is excited and the excited-state ion will disassociate.…”

Section: Introductionmentioning

confidence: 75%

“…In the early work, an approximation called the orientation-averaged molecular orbital (OAMO) was made [19] which greatly reduced the computer demands, and this approximation worked well for ionization of H 2 [20][21][22][23] but not so well for the larger molecules [6,7,[21][22][23][24][25][26][27]. Very recently, the computer codes were parallelized such that proper averages over orientations can be performed and the agreement between experiment and theory was greatly improved for the larger molecules [28].…”

Section: Introductionmentioning

confidence: 99%

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Fully differential cross sections for electron-impact excitation-ionization of alignedD2

et al. 2014

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We examine fully differential cross sections for 176 eV electron-impact dissociative excitation-ionization of orientated D 2 for transitions to final ion states 2sσ g , 2pσ u , and 2pπ u . In previous work [Phys. Rev. A 88, 062705 (2013)], we calculated these cross sections using the molecular four-body distorted wave (M4DW) method with the ground-state D 2 wave function being approximated by a product of two Dyson 1s-type orbitals. The theoretical results were compared with experimental measurements for five different orientations of the target molecule (four in the scattering plane and one perpendicular to the scattering plane). For the unresolved 2sσ g + 2pπ u final states, good agreement with experiment was found for two of the five measured orientations, and for the 2pσ u final state, good agreement was found for three of the five orientations. However, theory was a factor of 200 smaller than experiment for the 2pσ u state. In this paper, we investigate the importance of the approximation for the molecular ground-state wave function by repeating the M4DW calculation using a better variational wave function for the ground state.

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Section: Introductionmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

Fully differential cross sections for electron-impact excitation-ionization of alignedD2

et al. 2014

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“…In recent years, theory has made tremendous progress in describing the electron-impact ionization dynamics of simple atoms and molecules, see e.g. [9][10][11][12][13][14][15][16][17]. Much more challenging, however, is the treatment of more complex targets, like heavy atoms and molecules.…”

Section: Introductionmentioning

confidence: 99%

Electron-impact ionization of H2O at low projectile energy: Internormalized triple-differential cross sections in three-dimensional kinematics

et al. 2017

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We report a combined experimental and theoretical study on the electron-impact ionization of water (H 2 O) at the relatively low incident energy of E 0 = 81 eV in which either the 1b 1 or 3a 1 orbitals are ionized leading to the stable H 2 O + cation. The experimental data were measured using a reaction microscope, which can cover nearly the entire 4π solid angle for the secondary electron emission over a range of ejection energies. We present experimental data for the scattering angles of 6 • and 10 • for the faster of the two outgoing electrons as function of the detection angle of the secondary electron with energies of 5 eV and 10 eV. The experimental triple-differential cross sections are internormalized across the measured scattering angles and ejected energies. The experimental data are compared to predictions from two molecular three-body distorted-wave approaches. One applying the orientation-averaged molecular orbital (OAMO) approximation and one using a proper-average (PA) over orientation-dependent cross sections. The PA calculations are in better agreement with the experimental data than the OAMO calculations, for both the angular dependence and the relative magnitude of the observed cross section structures.

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“…In contrast, measurements at lower impact energies were performed by the Heidelberg group [9][10][11][12]. Using a reaction microscope their measurements were performed at an impact energy of 200 eV under conditions of highly asymmetric energy sharing between the two (e,2e) electrons [9,10] and at lower impact energies of 31.5 eV [12] and 54 eV [11] in later publications. All of these studies focused on transitions from the X 1 g + electronic ground state of H 2 to the vibrational continuum of the 1sσ g ground state of H 2 + .…”

Section: Introductionmentioning

confidence: 99%

Experimental and theoretical cross sections for molecular-frame electron-impact excitation-ionization of D2

et al. 2013

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We present both experimental and theoretical results for the dissociative ionization of D 2 molecules induced by electron impact. Cross sections are determined in the molecular frame and are fully differential in the energies and emission angles of the dissociation fragments. Transitions are considered from the X 1 g + electronic ground state of D 2 to the 2sσ g , 2pπ u and 2pσ u excited states of D 2 +. The experimental results are compared to calculations performed within the molecular four-body distorted-wave framework to describe the multicenter nature of the scattering process. The cross sections reveal a dramatic dependence on both the alignment of the internuclear axis with respect to the direction of the projectile momentum and on the symmetry of the excited dissociating state which is energetically resolved.

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Strong Molecular Alignment Dependence ofH2Electron Impact Ionization Dynamics

Cited by 44 publications

References 30 publications

Fully differential cross sections for electron-impact excitation-ionization of alignedD2

Fully differential cross sections for electron-impact excitation-ionization of alignedD2

Electron-impact ionization of H2O at low projectile energy: Internormalized triple-differential cross sections in three-dimensional kinematics

Experimental and theoretical cross sections for molecular-frame electron-impact excitation-ionization of D2

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