Global warming and SF6 molecule

Abstract

In this paper the basic SF6 molecule physical characteristics are given concerning its influence on global warming and green house effect. Absorption and relaxation characteristics of this molecule have been investigated within the frame of nonlinear molecule – strong laser field interaction in different gas mixtures. All experiments have been performed on a different gas mixture pressures to analyze and investigate relaxation and energy transfer characteristics of absorbing molecules and non-absorbing collision partners. To show the SF6 absorption and relaxation and energy transfer capability comparison between SF6 and C2H4 was given using the same experimental conditions and argon as a buffer gas. All measurement points and their calculated values presented in this paper have been obtained using the infrared-pulsed photoacoustics technique adopted for atmospheric and subatmospheric pressures

Electron impact scattering by SF6 molecule over an extensive energy range

“…4 SF 6 is also an efficacious infrared absorber and hence plays a key role in the photochemistry of the atmosphere as an ozone-depleting molecule. 5 This molecule is used appreciably in the magnesium and aluminium industry as a heavy and inert cover gas to isolate molten magnesium from oxygen and to reduce the porosity of cast aluminium, particularly in casting operations. 6 SF 6 is very suitable as an interrupting medium, since it is a 'self-healing' dielectric and is stable in the decomposition process.…”

Artificial Intelligence Application in Photoacoustic of Gases

“…Calculated theoretical signals are compared to experimental signals generated in an SF6+Ar gas mixture. Sulphur hexafluoride (SF6) as a greenhouse gas has a huge potential for climate impact in the future, due to its strong infrared (IC) absorption, long atmospheric lifetime (3,200 years) and high global warming potential (GWP) of 23,900 calculated over 100-year time horizon [22]. It is a human-made, powerful greenhouse gas emitted by a variety of industrial processes including aluminum melting, electric power transmission and distribution, magnesium processing, and semiconductor manufacturing.…”

“…Many quantities such as energy transfer collisional rate, energy transfer probability, and collisional crosssection, are V−T relaxation time dependent. Furthermore, this quantity could be used as a basic parameter for different models of energy transfer in the atmosphere [22]. Finding a reliable method for determination of V−T is a particularly challenging task, due to its dependence on the spatial profile of the laser beam [26,27].…”

Gas-based spectral filter for mitigating 10.6 μm radiation in CO 2 laser produced plasma extreme ultraviolet sources

“…9 Some gases that have been reported to absorb radiation close to 10.6 μm include trichloroethylene (C 2 HCl 3 ), 10 ammonia(NH 3 ), 11 ethylene (C 2 H 4 ), 12,13 carbon dioxide (CO 2 ) 14-17 and sulfur hexafluoride (SF 6 ). 13,[18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] Of the gases mentioned, SF 6 had the highest measured ratio of peak absorption in the infrared wavelength region close to 10.6 μm 28,36 compared to EUV absorption at 13.5 nm. 37 Also, the multiphoton absorption character of SF 6 allows for the possible absorption of 33 photons per molecule before dissociation.…”