Absorption structures of SF<sub>6</sub>in the VUV region

Sasanuma, Michio; Ishiguro, Eiji; Masuko, H; Morioka, Y; Nakamura, Masatoshi

doi:10.1088/0022-3700/11/21/011

Cited by 29 publications

(7 citation statements)

References 21 publications

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“…The results are then compared with the SF• profiles observed. ion coincidence technique [Hitchcock and Van der Wiel, 1979], and also between 30 and 120 nm [Sasanuma et al, 1978]. Figure 1 gives the photoabsorption coefficient of SF6 in the 40-240 nm wavelength interval with the data of the above cited authors being indicated.…”

Section: Paper Number 2000jd900700mentioning

confidence: 95%

Three‐dimensional model simulations of SF₆ with mesospheric chemistry

Reddmann¹,

Ruhnke²,

Kouker³

2001

J. Geophys. Res.

129

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Good agreement with observations is found for inert SF6 transport. However, when mesospheric loss is included in the model, significant deviations are found for polar winter observations above 25 kin. Chemical loss by electron attachment without reactions yielding SF6 again is not compatible with observations. The atmospheric lifetime of SF6 spans 400 to 10,000 years, depending on the assumed loss mechanism and the value for the electron density in the stratosphere.

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Section: Paper Number 2000jd900700mentioning

confidence: 95%

Three‐dimensional model simulations of SF₆ with mesospheric chemistry

Reddmann¹,

Ruhnke²,

Kouker³

2001

J. Geophys. Res.

129

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“…The valence-shell photoabsorption spectrum is, however, more complicated due to the overlap of a large number of excitation and continuum features. Tentative interpretations of the valence-shell spectrum have been made by Hay,16 Sasanuma et aZ.,17 Robin,24 and most recently Sze and Brion. 21 Despite the somewhat limited energy resolution of our spectrometer, the present GOS study attempts, fot: the first time, to provide some insight into the valence-shell electronic structure of SF 6 by investigating the nondipole transitions that are not easily observable using optical techniques.…”

Section: Introductionmentioning

confidence: 97%

Absolute transition probability measurement of nondipole valence-shell (7–70 eV) electronic transitions of SF6 by angle-resolved electron energy loss spectroscopy

Ying

Daniels

Mathers

et al. 1993

The Journal of Chemical Physics

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Articles you may be interested inNonoptical excited state spectroscopy of CF3Cl, CF2Cl2, and CFCl3: Bethe surfaces, and absolute transition probability measurement of preionizationedge valence and Rydberg transitions by angleresolved electron energy loss spectroscopy Nonoptical excited state spectroscopy of CHF2Cl: Characterization of nondipole n→σ* valence transitions by angleresolved electron energy loss spectroscopy A coplanar electron spectrometer has been constructed for angle-resolved electron energy loss measurements. . The experimental arrangement and performance of the spectrometer are described. Absolute absorption transition probabilities (or generalized oscillator strengths) of valence-shell (7-70 eV) electronic transitions of SF 6 have been determined as a function of energy loss and momentum transfer at an impact energy of 2.5 keY. New nondipole transitions have been observed at nonzero momentum transfer. Together with the term values obtained from previous dipole electron energy loss and photoabsorption measurements, the momentum' transfer dependence of the transition probabilities can be used to provide tentative assignments of the observed nondipole valence-shell transitions of SF 6. Despite the complexity of the electronic structure of SF 6 , the present work demonstrates the feasibility of angle-resolved electron energy loss spectroscopy for investigating nondipole phenomena and related electron-induced excitation processes.3390

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“…Nitrogen absorption has been studied many times with special attention being paid to its band structure. We found three sources of absorption data for SF6 shown in Figure 26 [51], [52], [48]. Of these three, we chose the data by Aubrecht to put in the code because it was the most recent and agreed with the data from Sasanuma.…”

Section: Monte Carlo Code Modifications For Sf6mentioning

confidence: 99%

Surface interactions involved in flashover with high density electronegative gases.

Hodge¹,

Warne²,

Jorgenson³

et al. 2010

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This report examines the interactions involved with flashover along a surface in high density electronegative gases. The focus is on fast ionization processes rather than the later time ionic drift or thermalization of the discharge. A kinetic simulation of the gas and surface is used to examine electron multiplication and includes gas collision, excitation and ionization, and attachment processes, gas photoionization and surface photoemission processes, as well as surface attachment. These rates are then used in a 1.5D fluid ionization wave (streamer) model to study streamer propagation with and without the surface in air and in SF6. The 1.5D model therefore includes rates for all these processes. To get a better estimate for the behavior of the radius we have studied radial expansion of the streamer in air and in SF6. The focus of the modeling is on voltage and field level changes (with and without a surface) rather than secondary effects, such as, velocities or changes in discharge path. An experiment has been set up to carry out measurements of threshold voltages, streamer velocities, and other discharge characteristics. This setup includes both electrical and photographic diagnostics (streak and framing cameras). We have observed little change in critical field levels (where avalanche multiplication sets in) in the gas alone versus with the surface. Comparisons between model calculations and experimental measurements are in agreement with this. We have examined streamer sustaining fields (field which maintains ionization wave propagation) in the gas and on the surface. Agreement of the gas levels with available literature is good and agreement between experiment and calculation is good also. Model calculations do not indicate much difference between the gas alone versus the surface levels. Experiments have identified differences in velocity between streamers on the surface and in the gas alone (the surface values being larger).

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Absorption structures of SF₆in the VUV region

Cited by 29 publications

References 21 publications

Three‐dimensional model simulations of SF₆ with mesospheric chemistry

Three‐dimensional model simulations of SF₆ with mesospheric chemistry

Absolute transition probability measurement of nondipole valence-shell (7–70 eV) electronic transitions of SF6 by angle-resolved electron energy loss spectroscopy

Surface interactions involved in flashover with high density electronegative gases.

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Absorption structures of SF6in the VUV region

Cited by 29 publications

References 21 publications

Three‐dimensional model simulations of SF6 with mesospheric chemistry

Three‐dimensional model simulations of SF6 with mesospheric chemistry

Absolute transition probability measurement of nondipole valence-shell (7–70 eV) electronic transitions of SF6 by angle-resolved electron energy loss spectroscopy

Surface interactions involved in flashover with high density electronegative gases.

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Product

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Absorption structures of SF₆in the VUV region

Three‐dimensional model simulations of SF₆ with mesospheric chemistry

Three‐dimensional model simulations of SF₆ with mesospheric chemistry