The ionization dynamics of SF<sub>6</sub>: a full dimensional direct<i>ab initio</i>dynamics study

Tachikawa, Hiroto

doi:10.1088/0953-4075/33/9/304

Cited by 9 publications

(12 citation statements)

References 21 publications

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“…56 However, even ground state SF 6 + fragmentation is expected to proceed rapidly on the femtosecond time scale. 57 It is therefore reasonable to assume that the observed angular distribution reflects the dissociation axis angle with respect to the laser polarization.…”

Section: ■ Experimental Setupmentioning

confidence: 99%

3D Coincidence Imaging Disentangles Intense Field Double Detachment of SF₆^–

et al. 2015

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The efficient intense field double detachment of molecular anions observed in SF6(–) is studied by 3D coincidence imaging of the dissociation products. The dissociation anisotropy and kinetic energy release distributions are determined for the energetically lowest double detachment channel by virtue of disentangling the SF5(+) + F fragmentation products. The observed nearly isotropic dissociation with respect to the linear laser polarization and surprisingly high kinetic energy release events suggest that the dissociation occurs on a highly excited state. Rydberg (SF6(+))* states composed of a highly repulsive dication core and a Rydberg electron are proposed to explain the observed kinetic energy release, accounting also for the efficient production of all possible cationic fragments at equivalent laser intensities.

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Section: ■ Experimental Setupmentioning

confidence: 99%

3D Coincidence Imaging Disentangles Intense Field Double Detachment of SF₆^–

et al. 2015

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“… 4 According to an ab initio dynamics study, vertical ionization of isolated SF 6 produces F + SF 5 + fragments that will separate within 0.2 ps with ∼1.1 eV channeled into kinetic energy. 21 The challenge to the experimentalist is to quench this fierce reaction.…”

mentioning

confidence: 99%

“… 32 Upon pickup of SF 6 , the dopant and the charge will move toward each other through the superfluid medium; charge transfer will release ∼8.0 eV (see the Supporting Information ). Given the large (1.1 eV) energy that is channeled into the F + SF 5 + fragments upon vertical ionization, 21 and the disparity in the mass of F and He, whether the helium matrix can fully cage the products is questionable. However, all that is needed to stabilize SF 6 + is that the fluorine atom is, with some reasonable probability, thermalized and trapped in the HND.…”

mentioning

confidence: 99%

SF₆⁺: Stabilizing Transient Ions in Helium Nanodroplets

Albertini

Bergmeister

Laimer

et al. 2021

J. Phys. Chem. Lett.

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There are myriad ions that are deemed too short-lived to be experimentally accessible. One of them is SF 6 + . It has never been observed, although not for lack of trying. We demonstrate that long-lived SF 6 + can be formed by doping charged helium nanodroplets (HNDs) with sulfur hexafluoride; excess helium is then gently stripped from the doped HNDs by collisions with helium gas. The ion is identified by high-resolution mass spectrometry (resolution m /Δ m = 15000), the close agreement between the expected and observed yield of ions that contain minor sulfur isotopes, and collision-induced dissociation in which mass-selected He n SF 6 + ions collide with helium gas. Under optimized conditions, the yield of SF 6 + exceeds that of SF 5 + . The procedure is versatile and suitable for stabilizing many other transient molecular ions.

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“…The degree of fragmentation of the compound can be seen directly from the mass spectrum. In this study, the pure SF 6 gas was detected by EIMS and EAMS, respectively, and the mass spectra results were shown in Figure 3 [22][23][24]. The molecular ion of SF 6 was further fragmented easily [25].…”

Section: Electron Attachment Mass Spectrometrymentioning

confidence: 83%

Detection of decomposition products of SF6/air gas mixture by electron attachment mass spectrometry

et al. 2021

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Sulphur hexafluoride (SF 6 ) is widely used in gas insulation, and its decomposition products can be used to diagnose potential insulation failures. Quick and accurate detection of decomposition products can help to understand equipment-operating conditions in time. In this study, the decomposition products of SF 6 /air gas mixtures under different pulsed discharge voltages were studied. It was found that the main products were SOF 2 , SO 2 F 2 , SO 2 , CF 4 and SOF 4 , and the yields of SOF 2 , SO 2 F 2 , SO 2 and SOF 4 increased with the number of discharge pulse. The productive rate of SOF 2 , SO 2 and SOF 4 were positively correlated with the discharge voltage, and when the discharge voltage increased from 5 to 15 kV, their yields after 50,000 discharges increased by 49%, 120% and 1100%, respectively. The productive rate of SOF 2 and SO 2 were positively correlated with the proportion of air in the gas mixtures while that of SOF 4 was opposite. When the proportion of air increases from 0% to 90%, their yields after 50,000 discharges became 270%, 3169% and 10% of the originals, respectively. In addition, the productive rate of SO 2 F 2 was not affected by discharge voltage and the proportion of air in the gas mixtures. SO 2 F 2 , SOF 2 , SOF 4 and SO 2 can be used as the basis for judging the discharge failures and the discharge degree of power equipment.This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.

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The ionization dynamics of SF₆: a full dimensional directab initiodynamics study

Cited by 9 publications

References 21 publications

3D Coincidence Imaging Disentangles Intense Field Double Detachment of SF₆^–

3D Coincidence Imaging Disentangles Intense Field Double Detachment of SF₆^–

SF₆⁺: Stabilizing Transient Ions in Helium Nanodroplets

Detection of decomposition products of SF6/air gas mixture by electron attachment mass spectrometry

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The ionization dynamics of SF6: a full dimensional directab initiodynamics study

Cited by 9 publications

References 21 publications

3D Coincidence Imaging Disentangles Intense Field Double Detachment of SF6–

3D Coincidence Imaging Disentangles Intense Field Double Detachment of SF6–

SF6+: Stabilizing Transient Ions in Helium Nanodroplets

Detection of decomposition products of SF6/air gas mixture by electron attachment mass spectrometry

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Product

Resources

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The ionization dynamics of SF₆: a full dimensional directab initiodynamics study

3D Coincidence Imaging Disentangles Intense Field Double Detachment of SF₆^–

3D Coincidence Imaging Disentangles Intense Field Double Detachment of SF₆^–

SF₆⁺: Stabilizing Transient Ions in Helium Nanodroplets