Observation of vibration-dependent electron anisotropy in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msubsup><mml:mi mathvariant="normal">O</mml:mi><mml:mrow><mml:mn>2</mml:mn></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msubsup></mml:mrow></mml:math>photodetachment

Mabbs, Richard; Mbaiwa, Foster; Wei, Jie; Duzor, Matthew Van; Gibson, S. T.; Cavanagh, Steven; Lewis, B. R.

doi:10.1103/physreva.82.011401

Cited by 24 publications

(19 citation statements)

References 38 publications

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“…However, experimental evidence of vibrational influence on the photoelectron angular distributions ͑PADs͒ in negative-ion photodetachment has so far been sparse, and little attention has been paid to such effects in theoretical treatments of direct detachment processes. In a recent communication, 1 we reported a strong dependence of the PADs in O 2 − ͑X 2 ⌸ g , vЉ =0͒ photodetachment on the final vibrational state of the neutral, O 2 ͑X 3 ⌺ g − , vЈ =1-4͒. These results provided experimental evidence of vibronic coupling in the anion ground electronic state, supplying essential data for the evaluation and refinement of existing theoretical models.…”

Section: Introductionmentioning

confidence: 72%

“…Furthermore, the results have been verified independently in the different laboratories of the authors, with each set of measurements being in excellent agreement. 1 For the remainder of this work, we focus on the relationship between ␤ and E and in particular the effect that the level of vibrational excitation of the neutral residue seems to exert. In Fig.…”

Section: B the Photoelectron Angular Distributionsmentioning

confidence: 99%

“…1 While several theoretical treatments have been developed to treat photoelectron angular distributions from diatomic molecules, the effect of accompanying vibrational excitation is almost completely ignored ͑with the notable exception of Ref. 44͒, presumably in part due to a lack of experimental data.…”

Section: Introductionmentioning

confidence: 99%

“…1,[27][28][29][30][31][32][33][34][35][36][37][38] Until very recently, much less data were reported regarding the PAD. 1,28,35 Among other anions, the prominent dependence of photoelectron anisotropy on the final vibrational state of the neutral was reported in the photodetachment of NO − . 39 In the case of neutral diatomic molecules, dramatic changes in the PAD have been observed between different vibronic photoionization bands of N 2 , CO, and O 2 .…”

Section: Introductionmentioning

confidence: 99%

“…1 Several detachment studies of this species have probed the photon energy dependence of the total detachment cross section [19][20][21][22][23][24][25][26] or reported the photoelectron spectrum of O 2 − . 1,[27][28][29][30][31][32][33][34][35][36][37][38] Until very recently, much less data were reported regarding the PAD. 1,28,35 Among other anions, the prominent dependence of photoelectron anisotropy on the final vibrational state of the neutral was reported in the photodetachment of NO − .…”

Section: Introductionmentioning

confidence: 99%

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Vibronic coupling in the superoxide anion: The vibrational dependence of the photoelectron angular distribution

Duzor

Mbaiwa

Wei

et al. 2010

The Journal of Chemical Physics

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The ZCC model invokes vibrational channel specific "detachment orbitals" and attributes this behavior to coupling of the electronic and nuclear motion in the parent anion. The spatial extent of the model detachment orbital is dependent on the final state of O 2 : the higher the neutral vibrational excitation, the larger the electron binding energy. Although vibronic coupling is ignored in most theoretical treatments of PADs in the direct photodetachment of molecular anions, the present findings clearly show that it can be important. These results represent a benchmark data set for a relatively simple system, upon which to base rigorous tests of more sophisticated models.

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Section: Introductionmentioning

confidence: 72%

Section: B the Photoelectron Angular Distributionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Vibronic coupling in the superoxide anion: The vibrational dependence of the photoelectron angular distribution

Duzor

Mbaiwa

Wei

et al. 2010

The Journal of Chemical Physics

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Deprotonation of Isoxazole: A Photoelectron Imaging Study

2020

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We report a photoelectron imaging study of gas-phase deprotonation of isoxazole in which spectroscopic data are compared to the results of electronic structure calculations for the anion products corresponding to each of three possible deprotonation sites. The observed photoelectron spectra are assigned to a mixture of the anion isomers. Deprotonation at the most acidic (C5) and the least acidic (C4) positions yields the respective C5- and C4-isoxazolide anions, while the reaction at the intermediate-acidity C3 site leads to a cleavage of the O–N bond and an opening of the ring in the anion. Following photodetachment, the ground states of neutral C5- and C4-isoxazolyl are assigned to be σ radicals (X 2A′), while the ground-state neutral derived from the ring-open C3-anion is a π radical (X 2A″). The relative intensities of the spectral bands exhibit sensitivity to the ion source conditions, giving evidence of competing and varying contributions of the dominant C5 and C3, as well as possible C4, deprotonation pathways.

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Autodetachment over Broad Photon Energy Ranges in the Anion Photoelectron Spectra of [O₂–M]⁻ (M = Glyoxal, Methylglyoxal, or Biacetyl) Complex Anions

et al. 2021

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Complexes of anion−neutral pairs are prevalent in chemical and physical processes in the interstellar medium, the atmosphere, and biological systems, among others. However, bimolecular anionic species that cannot be described as simple ion−molecule complexes due to their competitive electron affinities have received less attention. In this study, the [O 2 −M] − (M = glyoxal, methylglyoxal, or biacetyl) anion photoelectron spectra obtained with several different photon energies are reported and interpreted in the context of ab initio calculations. The spectra do not resemble the photoelectron spectra of M − or O 2 − "solvated" by a neutral partner. Rather, all spectra are dominated by nearthreshold autodetachment from what are likely transient dipole bound states of the cis conformers of the complex anions. Very low Franck−Condon overlap between the neutral M•O 2 van der Waals clusters and the partial covalently bound complex anions results in low-intensity, broad direct detachment observed in the spectra. The [O 2 -glyoxal] − spectra measured with 2.88 and 3.495 eV photon energies additionally exhibit features at ∼0.5 eV electron kinetic energy, which is more difficult to explain, though there are numerous quasibound states of the anion that may be involved. Overall, these features point to the inadequacy of describing the complex anions as simple ion−molecule complexes.

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Observation of vibration-dependent electron anisotropy inO2−photodetachment

Cited by 24 publications

References 38 publications

Vibronic coupling in the superoxide anion: The vibrational dependence of the photoelectron angular distribution

Vibronic coupling in the superoxide anion: The vibrational dependence of the photoelectron angular distribution

Deprotonation of Isoxazole: A Photoelectron Imaging Study

Autodetachment over Broad Photon Energy Ranges in the Anion Photoelectron Spectra of [O₂–M]⁻ (M = Glyoxal, Methylglyoxal, or Biacetyl) Complex Anions

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Observation of vibration-dependent electron anisotropy inO2−photodetachment

Cited by 24 publications

References 38 publications

Vibronic coupling in the superoxide anion: The vibrational dependence of the photoelectron angular distribution

Vibronic coupling in the superoxide anion: The vibrational dependence of the photoelectron angular distribution

Deprotonation of Isoxazole: A Photoelectron Imaging Study

Autodetachment over Broad Photon Energy Ranges in the Anion Photoelectron Spectra of [O2–M]− (M = Glyoxal, Methylglyoxal, or Biacetyl) Complex Anions

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Autodetachment over Broad Photon Energy Ranges in the Anion Photoelectron Spectra of [O₂–M]⁻ (M = Glyoxal, Methylglyoxal, or Biacetyl) Complex Anions