Development and characterization of a multiple-coincidence ion-momentum imaging spectrometer

Laksman, Joakim; Céolin, Denis; Månsson, Erik; Sörensen, Stacey Ristinmaa; Gisselbrecht, Mathieu

doi:10.1063/1.4853435

Cited by 22 publications

(20 citation statements)

References 25 publications

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“…Momentum-resolved, multiple-ion-coincidence measurements with high-resolution synchrotron radiation can directly correlate the F and Xe fragment ions and their energies. 82,83 A recent experiment on core-hole decays of CS 2 using coincidence spectroscopy revealed two charge redistribution and ion fragmentation mechanisms in which the S 1s core hole can be considered to be either localized or delocalized on one or two of the S sites. 84 It would be interesting to investigate such effects for the case of the F 1s-LUMO resonance of XeF 2 .…”

Section: Discussionmentioning

confidence: 99%

Inner-shell photoionization and core-hole decay of Xe and XeF2

Southworth

Wehlitz

Picón

et al. 2015

The Journal of Chemical Physics

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Photoionization cross sections and partial ion yields of Xe and XeF2 from Xe 3d(5/2), Xe 3d(3/2), and F 1s subshells in the 660-740 eV range are compared to explore effects of the F ligands. The Xe 3d-ϵf continuum shape resonances dominate the photoionization cross sections of both the atom and molecule, but prominent resonances appear in the XeF2 cross section due to nominal excitation of Xe 3d and F 1s electrons to the lowest unoccupied molecular orbital (LUMO), a delocalized anti-bonding MO. Comparisons of the ion products from the atom and molecule following Xe 3d photoionization show that the charge-state distribution of Xe ions is shifted to lower charge states in the molecule along with production of energetic F(+) and F(2+) ions. This suggests that, in decay of a Xe 3d core hole, charge is redistributed to the F ligands and the system dissociates due to Coulomb repulsion. The ion products from excitation of the F 1s-LUMO resonance are different and show strong increases in the yields of Xe(+) and F(+) ions. The subshell ionization thresholds, the LUMO resonance energies, and their oscillator strengths are calculated by relativistic coupled-cluster methods and agree well with measurements.

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Section: Discussionmentioning

confidence: 99%

Inner-shell photoionization and core-hole decay of Xe and XeF2

Southworth

Wehlitz

Picón

et al. 2015

The Journal of Chemical Physics

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“…27 The lens potential used in this study ensures that all ions up to a kinetic energy of about 19 eV are collected; this has been verified in separate studies. 28 The measurements were performed at the soft x ray undulator beamline I411 at MAX-lab in Lund, Sweden. 29 The contribution from secondorder light for the photon energies in this study is negligible.…”

Section: Methodsmentioning

confidence: 99%

Role of the Renner-Teller effect after core hole excitation in the dissociation dynamics of carbon dioxide dication

Laksman¹,

Månsson

Grünewald³

et al. 2012

The Journal of Chemical Physics

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The fragmentation of the doubly-charged carbon dioxide molecule is studied after photoexcitation to the C 1s12πu and O 1s12πu states using a multicoincidence ion-imaging technique. The bent component of the Renner-Teller split states populated in the 1s→ π* resonant excitation at both the carbon and oxygen 1s ionization edges opens pathways to potential surfaces in highly bent geometries in the dication. Evidence for a complete deformation of the molecule is found in the coincident detection of C+ and \documentclass[12pt]{minimal}\begin{document}${\rm O}_2^+$\end{document}O2+ ions. The distinct alignment of this fragmentation channel indicates rapid deformation and subsequent fragmentation. Investigation of the complete atomization dynamics in the dication leading to asymmetric charge separation shows that the primary dissociation mechanisms, sequential, concerted, and asynchronous concerted, are correlated to specific fragment kinetic energies. The study shows that the bond angle in fragmentation can extend below 20°.

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“…According to them, the timeof-flight difference (∆TOF = T 0L (R) − T 0L (0)) is proportional to the square root of mass ( √ m) of the particle, where T 0L (R) is same as described before and T 0L (0) is the time-of-flight of particles with p x = 0, p y = 0 and p z = 0. Unlike, Bomme et al, Laksman and his co-workers 31 have suggested that instead of √ m it should be  m/q. However, in their case, the major contribution to the ∆TOF comes from the field inhomogeneity near the detector and drift tube interface.…”

Section: Simulation Resultsmentioning

confidence: 92%

“…All these spectrometers described above are single field WileyMcLaren type spectrometers. There is only one recent work by Laksman et al, 31 in which the authors have combined both time and space focusing together in a two-field type of spectrometer. In this article, we present detailed features of a three dimensional velocity imaging spectrometer and discuss how this spectrometer can be used for a wide range of recoil ion energy to study fragmentation of atoms and molecules.…”

Section: Introductionmentioning

confidence: 98%

A recoil ion momentum spectrometer for molecular and atomic fragmentation studies

Khan

Tribedi

Misra

2015

Review of Scientific Instruments

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We report the development and performance studies of a newly built recoil ion momentum spectrometer for the study of atomic and molecular fragmentation dynamics in gas phase upon the impact of charged particles and photons. The present design is a two-stage Wiley-McLaren type spectrometer which satisfies both time and velocity focusing conditions and is capable of measuring singly charged ionic fragments up-to 13 eV in all directions. An electrostatic lens has been introduced in order to achieve velocity imaging. Effects of the lens on time-of-flight as well as on the position have been investigated in detail, both, by simulation and in experiment. We have used 120 keV proton beam on molecular nitrogen gas target. Complete momentum distributions and kinetic energy release distributions have been derived from the measured position and time-of-flight spectra. Along with this, the kinetic energy release spectra of fragmentation of doubly ionized nitrogen molecule upon various projectile impacts are presented.

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Development and characterization of a multiple-coincidence ion-momentum imaging spectrometer

Cited by 22 publications

References 25 publications

Inner-shell photoionization and core-hole decay of Xe and XeF2

Inner-shell photoionization and core-hole decay of Xe and XeF2

Role of the Renner-Teller effect after core hole excitation in the dissociation dynamics of carbon dioxide dication

A recoil ion momentum spectrometer for molecular and atomic fragmentation studies

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