Sulfur hexafluoride

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Phase change data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
BS - Robert L. Brown and Stephen E. Stein
TRC - Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director
AC - William E. Acree, Jr., James S. Chickos

Quantity Value Units Method Reference Comment
Tboil209.3KN/APCR Inc., 1990BS
Quantity Value Units Method Reference Comment
Ttriple223.72KN/AOhta, Yamamuro, et al., 1994Crystal phase 1 phase; Uncertainty assigned by TRC = 0.01 K; TRC
Quantity Value Units Method Reference Comment
Tc568.8KN/AMatzik and Schneider, 1985Uncertainty assigned by TRC = 0.7 K; TRC
Tc318.72KN/AGoloborod'ko and Khodeeva, 1972Vis, as Goloborod'ko and Khodeeva Zh.Fiz.Khim. 1969,43,1340; TRC
Tc318.71KN/AMakarevich, Sokolova, et al., 1968Uncertainty assigned by TRC = 0.005 K; TRC
Tc318.76KN/AKhodeeva, 1966TRC
Tc591.85KN/AAtack and Schneider, 1951Uncertainty assigned by TRC = 0.05 K; By observation of meniscus and plot of density vs. temp. Temperature measured with Pt Res. Therm., calibration at N.B.S., presumably IPTS-48; TRC
Quantity Value Units Method Reference Comment
Pc24.57atmN/AMatzik and Schneider, 1985Uncertainty assigned by TRC = 0.30 atm; TRC
Pc37.094atmN/AMakarevich, Sokolova, et al., 1968Uncertainty assigned by TRC = 0.005 atm; TRC
Quantity Value Units Method Reference Comment
Vc0.198l/molN/AMakarevich, Sokolova, et al., 1968Uncertainty assigned by TRC = 0.0004 l/mol; Vis, rect; method as Sorina and Efremova Russ. J. Phys. Chem. 1966, 40, 143.; TRC
Vc0.197l/molN/AKhodeeva, 1966Vis, samples thoroughly purified; TRC
Quantity Value Units Method Reference Comment
ρc5.0581mol/lN/AMakarevich and Sokolova, 1973Uncertainty assigned by TRC = 0.001 mol/l; Vis, volume adjusted by injection of mercury; TRC
ρc5.147mol/lN/AAtack and Schneider, 1951Uncertainty assigned by TRC = 0.004 mol/l; from plot of density vs temperature, at the Tc; TRC

Enthalpy of sublimation

ΔsubH (kcal/mol) Temperature (K) Reference Comment
5.54 ± 0.002186.Ohta, Yamamuro, et al., 1994, 2AC
5.57191.Klemm and Henkel, 1932Based on data from 175. to 207. K.; AC

In addition to the Thermodynamics Research Center (TRC) data available from this site, much more physical and chemical property data is available from the following TRC products:


Gas phase ion energetics data

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Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data evaluated as indicated in comments:
HL - Edward P. Hunter and Sharon G. Lias
L - Sharon G. Lias

Data compiled as indicated in comments:
MM - Michael M. Meot-Ner (Mautner)
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
LL - Sharon G. Lias and Joel F. Liebman
B - John E. Bartmess

Quantity Value Units Method Reference Comment
IE (evaluated)15.32 ± 0.02eVN/AN/AL
Quantity Value Units Method Reference Comment
Proton affinity (review)137.5kcal/molN/AHunter and Lias, 1998HL
Quantity Value Units Method Reference Comment
Gas basicity131.6kcal/molN/AHunter and Lias, 1998HL

Electron affinity determinations

EA (eV) Method Reference Comment
0.910 ± 0.070N/AMenk, Das, et al., 2014B
1.030 ± 0.050N/ATroe, Miller, et al., 2012W4 theory supports this (12KER/MAR) and lower level calculations have flaws; B
1.070 ± 0.070TDAsChen, Wiley, et al., 1994B
1.15 ± 0.15KineChen, Shuie, et al., 1988From the temperature dependence of the API spectra of SF5-/SF6-; B
1.05 ± 0.10TDEqGrimsrud, Chowdhury, et al., 1985ΔGea(423 K) = -29.8 kcal/mol; ΔSea = +13 eu. See also Chowdhury, Heinis, et al., 1986, Bopp, Roscioli, et al., 2007; B
1.39 ± 0.13KineHeneghan and Benson, 1983B
0.799982KineLifshitz, 1983Review: literature consistent with ΔS(act) for detachment = -14 eu; B
1.20 ± 0.30N/AChase Jr., Curnutt, et al., 1982Literature average; B
0.542052LPDDrzaic and Brauman, 1982B
>0.934931R-ARefaey and Franklin, 1978B
2.60 ± 0.10ECDChen and Chen, 2007B
2.60 ± 0.10ECDChen and Chen, 2007B
3.15999LPDDatskos, Carter, et al., 1995Stated electron affinity is the Vertical Detachment Energy; B
>0.698163ECDChen and Wentworth, 1983B
0.46 ± 0.20NBIECompton, Reinhardt, et al., 1978B
0.75 ± 0.10NBIELeffert, Tang, et al., 1974B
0.54 ± 0.17NBIECompton and Cooper, 1973B
0.53 ± 0.10NBIECompton, Cooper, et al., 1973B
>0.60 ± 0.10EndoLifshitz, Tiernan, et al., 1973B
0.95 ± 0.52IMRBFehsenfeld, 1971B
0.43IMRBLifshitz, Hughes, et al., 1970B
>0.698163ECDChen, George, et al., 1968B
1.10002ESCompton, Christophorou, et al., 1966B
0.32 ± 0.15NBIEHubers and Los, 1975B
1.49 ± 0.22SIKay and Page, 1964The Magnetron method, lacking mass analysis, is not considered reliable.; B

Gas basicity at 298K

Gas basicity (review) (kcal/mol) Reference Comment
137.5Pepi, Ricci, et al., 2005T = 298K; PA(SF6) equated to PA(N2O) based on dissociative PT reactions with large entropy changes that may affect the kinetics.; MM

Ionization energy determinations

IE (eV) Method Reference Comment
15.30PEDelwiche, 1969RDSH
15.30PEDelwiche, 1969RDSH
15.35 ± 0.02PEFrost, McDowell, et al., 1967RDSH
15.7PEBieri, Asbrink, et al., 1982Vertical value; LBLHLM
15.7PESell and Kupperman, 1978Vertical value; LLK
15.69PEPotts, Lempka, et al., 1970Vertical value; RDSH
15.81PEDelwiche, 1969Vertical value; RDSH

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
F+37.5 ± 1.0?EIPullen and Stockdale, 1976LLK
FS+37.6 ± 3.0?EIPullen and Stockdale, 1976LLK
FS+30.5 ± 0.5?EIHildenbrand, 1973LLK
F2+18.0 ± 1.0?EIPullen and Stockdale, 1976LLK
F2S+27.0 ± 0.3?EIPullen and Stockdale, 1976LLK
F2S+27.5 ± 0.5?EIHildenbrand, 1973LLK
F3S+18.79 ± 0.14?PIMitsuke, Suzuki, et al., 1990LL
F3S+19.4 ± 0.5?PISasanuma, Ishiguro, et al., 1979LLK
F3S+19.6 ± 0.5?EIPullen and Stockdale, 1976LLK
F3S+20.0 ± 0.5?EIHildenbrand, 1973LLK
SF3+19.80 ± 0.10F2+F?EIDelwiche, 1969RDSH
F3S+21.53FPEDelwiche, 1969RDSH
F3S+19.8 ± 0.1F2+FPEDelwiche, 1969RDSH
F4S+19.1 ± 0.52FPISasanuma, Ishiguro, et al., 1979LLK
F4S+19.6 ± 1.02FEIPullen and Stockdale, 1976LLK
F4S+18.44 ± 0.102FEIHildenbrand, 1973LLK
F4S+18.5 ± 0.12FPEDelwiche, 1969RDSH
SF4+18.50 ± 0.102F?EIDelwiche, 1969RDSH
F5S+15.32 ± 0.04FPIMitsuke, Suzuki, et al., 1990LL
F5S+≤13.78FIMBStone and Wytenberg, 1989T = 298K; LL
F5S+13.97 ± 0.04FENDTichy, Javahery, et al., 1987LBLHLM
F5S+≤14.4FIMBShul, Upschulte, et al., 1987LBLHLM
F5S+14.62 ± 0.09FIMBBabcock and Streit, 1981LLK
F5S+15.3 ± 0.2FPISasanuma, Ishiguro, et al., 1979LLK
F5S+16.2 ± 0.2FEIPullen and Stockdale, 1976LLK
F5S+≤14.53 ± 0.05FPIPECOSimm, Danby, et al., 1975LLK
F5S+15.50 ± 0.10FEIHildenbrand, 1973LLK
F5S+15.75 ± 0.05FPEDelwiche, 1969RDSH
SF5+15.75 ± 0.05FEIDelwiche, 1969RDSH
SF5+15.29FPIDibeler and Walker, 1966RDSH
SF5+15.85 ± 0.15FEIFox and Curran, 1961RDSH
F5S+15.9 ± 0.2FEIDibeler and Mohler, 1948RDSH

References

Go To: Top, Phase change data, Gas phase ion energetics data, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

PCR Inc., 1990
PCR Inc., Research Chemicals Catalog 1990-1991, PCR Inc., Gainesville, FL, 1990, 1. [all data]

Ohta, Yamamuro, et al., 1994
Ohta, T.; Yamamuro, O.; Suga, H., Heat capacity and enthalpy of sublimation of sulful hexafluoride, J. Chem. Thermodyn., 1994, 26, 319-31. [all data]

Matzik and Schneider, 1985
Matzik, I.; Schneider, G.M., Fluid phase equilibria of binary mixtures of sulfur hexafluoride with octane, nonane, hendecane, and cis-decahydronaphthalene at temperature between 280 K and 440 K and at pressures up to 140 MPa, Ber. Bunsen-Ges. Phys. Chem., 1985, 89, 551. [all data]

Goloborod'ko and Khodeeva, 1972
Goloborod'ko, N.P.; Khodeeva, S.M., Russ. J. Phys. Chem. (Engl. Transl.), 1972, 46, 235-7. [all data]

Makarevich, Sokolova, et al., 1968
Makarevich, L.A.; Sokolova, E.S.; Sorina, G.A., Critical Parameters pf Sulfur Hexafluoride, Zh. Fiz. Khim., 1968, 42, 22-3. [all data]

Khodeeva, 1966
Khodeeva, S.M., Visual Observation of Gas-Gas Mixture, Russ. J. Phys. Chem. (Engl. Transl.), 1966, 40, 1061-3. [all data]

Atack and Schneider, 1951
Atack, D.; Schneider, W.G., The Coexistence Curve of Sulfur Hexafluoride in the Critical Region., J. Phys. Colloid Chem., 1951, 55, 532. [all data]

Makarevich and Sokolova, 1973
Makarevich, L.A.; Sokolova, O.N., Russ. J. Phys. Chem. (Engl. Transl.), 1973, 47, 436-7. [all data]

Ohta, Yamamuro, et al., 1994, 2
Ohta, Tomoko; Yamamuro, Osamu; Suga, Hiroshi, Heat capacity and enthalpy of sublimation of sulfur hexafluoride, The Journal of Chemical Thermodynamics, 1994, 26, 3, 319-331, https://doi.org/10.1016/0021-9614(94)90009-4 . [all data]

Klemm and Henkel, 1932
Klemm, Wilhelm; Henkel, Paul, «65533»ber einige physikalische Eigenschaften von SF6, SeF6, TeF6 und CF4, Z. Anorg. Allg. Chem., 1932, 207, 1, 73-86, https://doi.org/10.1002/zaac.19322070107 . [all data]

Hunter and Lias, 1998
Hunter, E.P.; Lias, S.G., Evaluated Gas Phase Basicities and Proton Affinities of Molecules: An Update, J. Phys. Chem. Ref. Data, 1998, 27, 3, 413-656, https://doi.org/10.1063/1.556018 . [all data]

Menk, Das, et al., 2014
Menk, S.; Das, S.; Blaum, K.; Froese, M.W.; Lange, M.; Mukherjee, M.; Repnow, R.; Schwalm, D.; von Hahn, R.; Wolf, A., Vibrational autodetachment of sulfur hexafluoride anions at its long-lifetime limit, Phys. Rev. A, 2014, 89, 2, 022502, https://doi.org/10.1103/PhysRevA.89.022502 . [all data]

Troe, Miller, et al., 2012
Troe, J.; Miller, T.M.; Viggiano, A.A., Communication: Revised electron affinity of SF6 from kinetic data, J. Chem. Phys., 2012, 136, 12, 121102, https://doi.org/10.1063/1.3698170 . [all data]

Chen, Wiley, et al., 1994
Chen, E.C.M.; Wiley, J.R.; Batten, C.F.; Wentworth, W.E., Determination of the Electron Affinities of Molecules Using Negative Ion Mass Spectrometry, J. Phys. Chem., 1994, 98, 1, 88, https://doi.org/10.1021/j100052a016 . [all data]

Chen, Shuie, et al., 1988
Chen, E.C.M.; Shuie, L.-R.; DSa, E.D.; Batten, C.F.; Wentworth, W.E., The Negative Ion States of SF6, J. Chem. Phys., 1988, 88, 8, 4711, https://doi.org/10.1063/1.454710 . [all data]

Grimsrud, Chowdhury, et al., 1985
Grimsrud, E.P.; Chowdhury, S.; Kebarle, P., Electron affinity of SF6 and perfluoromethylcyclohexane. The unusual kinetics of electron transfer reactions A- + B- + A, where A = SF6 or perfluorinated cycloalkanes, J. Chem. Phys., 1985, 83, 1059. [all data]

Chowdhury, Heinis, et al., 1986
Chowdhury, S.; Heinis, T.; Grimsrud, E.P.; Kebarle, P., Entropy Changes and Electron Affinities from Gas-Phase Electron Transfer Equilibria: A- + B = A + B-, J. Phys. Chem., 1986, 90, 12, 2747, https://doi.org/10.1021/j100403a037 . [all data]

Bopp, Roscioli, et al., 2007
Bopp, J.C.; Roscioli, J.R.; Johnson, M.A.; Miller, T.M.; Viggiano, A.A.; Villano, S.M.; Wren, S.W.; Lineberger, Spectroscopic characterization of the isolated SF6- and C4F8- anions: Observation of very long harmonic progressions in symmetric deformation modes upon photodetachment, J. Phys. Chem. A, 2007, 111, 7, 1214-1221, https://doi.org/10.1021/jp0665372 . [all data]

Heneghan and Benson, 1983
Heneghan, S.P.; Benson, S.W., Kinetics and thermochemistry of electron attachment to SF6, Int. J. Chem. Kinet., 1983, 15, 109. [all data]

Lifshitz, 1983
Lifshitz, C., Energy-entropy trade-offs in the unimolecular decompositions of SF6-, J. Phys. Chem., 1983, 87, 3474. [all data]

Chase Jr., Curnutt, et al., 1982
Chase Jr.; Curnutt, J.L.; Downy Jr.; McDonald, R.A.; Syverrud, A.N.; Valenzuela, E.A., JANAF Thermochemical Tables 1982 Supplement, J. Phys. Chem. Ref. Data, 1982, 11, 3, 695, https://doi.org/10.1063/1.555666 . [all data]

Drzaic and Brauman, 1982
Drzaic, P.S.; Brauman, J.I., Electron photodetachment of sulfur hexafluoride anion. Comments on the structure of SF6-, J. Am. Chem. Soc., 1982, 104, 13. [all data]

Refaey and Franklin, 1978
Refaey, K.M.A.; Franklin, J.L., Collisonal decomposition of SF6-, Int. J. Mass Spectrom. Ion Phys., 1978, 26, 125. [all data]

Chen and Chen, 2007
Chen, E.C.M.; Chen, E.S., Electron affinities and activation energies for reactions with thermal electrons: SF6 and SF5, Phys. Rev. A, 2007, 76, 3, 032508, https://doi.org/10.1103/PhysRevA.76.032508 . [all data]

Datskos, Carter, et al., 1995
Datskos, P.G.; Carter, J.G.; Christophorou, L.G., Photodetachment of SF6-, Chem. Phys. Lett., 1995, 239, 1-3, 38, https://doi.org/10.1016/0009-2614(95)00417-3 . [all data]

Chen and Wentworth, 1983
Chen, E.C.M.; Wentworth, W.E., Determination of molecular electron affinities using the electron capture detector in the pulse sampling mode at steady state, J. Phys. Chem., 1983, 87, 45. [all data]

Compton, Reinhardt, et al., 1978
Compton, R.N.; Reinhardt, P.W.; Cooper, C.D., Collisional ionization between fast alkali atoms and selected hexafluoride molecules, J. Chem. Phys., 1978, 68, 2023. [all data]

Leffert, Tang, et al., 1974
Leffert, C.B.; Tang, S.Y.; Rothe, E.W.; Cheng, T.C., Collisional ionization of Cs with SF6, J. Chem. Phys., 1974, 61, 4929. [all data]

Compton and Cooper, 1973
Compton, R.N.; Cooper, C.D., Molecular electron affinities from collisional ionization of cesium. II. SF6 and TeF6, J. Chem. Phys., 1973, 59, 4140. [all data]

Compton, Cooper, et al., 1973
Compton, R.N.; Cooper, R.D.; Divver, W.T.; Reinhardt, P.W., Molecular electron affinities from collisional ionization of cesium: SF6, Bull. Am. Phys. Soc., 1973, 18, 810. [all data]

Lifshitz, Tiernan, et al., 1973
Lifshitz, C.; Tiernan, T.O.; Hughes, B.M., Electron affinities from endothermic negative-ion charge transfer reactions. IV. SF6, selected fluorocarbons, and other polyatomic molecules, J. Chem. Phys., 1973, 59, 3182. [all data]

Fehsenfeld, 1971
Fehsenfeld, F.C., Ion Chemistry of SF6, J. Chem. Phys., 1971, 54, 438. [all data]

Lifshitz, Hughes, et al., 1970
Lifshitz, C.; Hughes, B.M.; Tiernan, T.O., Electron Affinities for Endothermic Negative Ion Charge Transfer Reactions: NO2 and SF6, Chem. Phys. Lett., 1970, 7, 4, 469, https://doi.org/10.1016/0009-2614(70)80339-6 . [all data]

Chen, George, et al., 1968
Chen, E.C.M.; George, R.D.; Wentworth, W.E., Experimental Determination of Rate Constants for Thermal Electron Attachment to Gaseous SF6 and C7F14, J. Chem. Phys., 1968, 49, 4, 1973, https://doi.org/10.1063/1.1670342 . [all data]

Compton, Christophorou, et al., 1966
Compton, R.N.; Christophorou, L.G.; Hurst, G.S.; Reinhardt, P.W., Nondissociative Electron Capture in Complex Molecules and Negative Ion Lifetimes, J. Chem. Phys., 1966, 45, 12, 4634, https://doi.org/10.1063/1.1727547 . [all data]

Hubers and Los, 1975
Hubers, M.M.; Los, J., Ion pair formation in alkali-SF6 collisions: Dependence on collisional and vibrational energy, Chem. Phys., 1975, 10, 235. [all data]

Kay and Page, 1964
Kay, J.; Page, F.M., Determination of Electron Affinities. Part 7.- Sulphur Hexafluoride and Disulphur Decafluoride, Trans. Farad. Soc., 1964, 60, 1042, https://doi.org/10.1039/tf9646001042 . [all data]

Pepi, Ricci, et al., 2005
Pepi, F.; Ricci, A.; Di Stefano, M.; Rosi, M., Gas phase protonation of trifluoromethyl sulfur pentafluoride, Phys. Chem. Chem. Phys., 2005, 7, 1181. [all data]

Delwiche, 1969
Delwiche, J., Ionization of sulphur hexafluoride by photon and electron impact, Bull. Classe Sci. Acad. Roy. Belg., 1969, 55, 215. [all data]

Frost, McDowell, et al., 1967
Frost, D.C.; McDowell, C.A.; Sandhu, J.S.; Vroom, D.A., Photoelectron spectrum of sulfur hexafluoride at 584 A, J. Chem. Phys., 1967, 46, 2008. [all data]

Bieri, Asbrink, et al., 1982
Bieri, G.; Asbrink, L.; Von Niessen, W., 30.4-nm He(II) photoelectron spectra of organic molecules, J. Electron Spectrosc. Relat. Phenom., 1982, 27, 129. [all data]

Sell and Kupperman, 1978
Sell, J.A.; Kupperman, A., Angular distributions in the photoelectron spectroscopy of SF6, Chem. Phys., 1978, 33, 379. [all data]

Potts, Lempka, et al., 1970
Potts, A.W.; Lempka, H.J.; Streets, D.G.; Price, W.C., Photoelectron spectra of the halides of elements in groups III, IV, V and VI, Phil. Trans. Roy. Soc. (London), 1970, A268, 59. [all data]

Pullen and Stockdale, 1976
Pullen, B.P.; Stockdale, J.A.D., Dissociative ionization of SF6 by electron impact, Int. J. Mass Spectrom. Ion Phys., 1976, 19, 35. [all data]

Hildenbrand, 1973
Hildenbrand, D.L., Mass spectrometric studies of some gaseous sulfur fluorides, J. Phys. Chem., 1973, 77, 897. [all data]

Mitsuke, Suzuki, et al., 1990
Mitsuke, K.; Suzuki, S.; Imamura, T.; Koyano, I., Negative-ion mass spectrometric study of ion-pair formation in the vacuum ultraviolet. III. SF6 Ü F- + SF5+, J. Chem. Phys., 1990, 93, 8717. [all data]

Sasanuma, Ishiguro, et al., 1979
Sasanuma, M.; Ishiguro, E.; Hayaisha, T.; Masuko, H.; Morioka, Y.; Nakajima, T.; Nakamura, M., Photoionisation of SF6 in the XUV region, J. Phys. B:, 1979, 12, 4057. [all data]

Stone and Wytenberg, 1989
Stone, J.A.; Wytenberg, W.J., A high pressure mass spectrometric study of the formation and chemistry of the pentafluorosulphur cation (SF5+), Int. J. Mass Spectrom. Ion Processes, 1989, 94, 269. [all data]

Tichy, Javahery, et al., 1987
Tichy, M.; Javahery, G.; Twiddy, N.D.; Ferguson, E.E., The thermal energy reactions HCl+ + SF6 Ü SF5+ + HF + Cl and HCl+ + CF4 Ü CF3+ + HF + Cl, Int. J. Mass Spectrom. Ion Processes, 1987, 79, 231. [all data]

Shul, Upschulte, et al., 1987
Shul, R.J.; Upschulte, B.L.; Passarella, R.; Keesee, R.G.; Castleman, A.W., Thermal energy charge-transfer reactions of Ar+ and Ar2+, J. Phys. Chem., 1987, 91, 2556. [all data]

Babcock and Streit, 1981
Babcock, L.M.; Streit, G.E., Ion-molecule reactions of SF6: Determination of I. P. (SF6), A. P.(SF5+/SF6), and D(SF5-F), J. Chem. Phys., 1981, 74, 5700. [all data]

Simm, Danby, et al., 1975
Simm, I.G.; Danby, C.J.; Eland, J.H.D.; Mansell, P.I., Translational energy release in the loss of fluorine atoms from the ions SF6+, CF4+ and C2F6+, J. Chem. Soc., 1975, 426. [all data]

Dibeler and Walker, 1966
Dibeler, V.H.; Walker, J.A., Photoionization efficiency curve for SF6 in the wavelength region 1050 to 600, J. Chem. Phys., 1966, 44, 4405. [all data]

Fox and Curran, 1961
Fox, R.E.; Curran, R.K., Ionization processes in CCl4 and SF6 by electron beams, J. Chem. Phys., 1961, 34, 1595. [all data]

Dibeler and Mohler, 1948
Dibeler, V.H.; Mohler, F.L., Dissociation of SF6, CF4, and SiF4 by electron impact, J. Res. Natl. Bur. Stand. U.S., 1948, 40, 25. [all data]


Notes

Go To: Top, Phase change data, Gas phase ion energetics data, References