(2H4)methane

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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 by: Thermodynamics Research Center, NIST Boulder Laboratories, Chris Muzny director

Quantity Value Units Method Reference Comment
Tfus89.780KN/AClusius and Popp, 1940Uncertainty assigned by TRC = 0.05 K
Quantity Value Units Method Reference Comment
Ttriple89.780KN/AColwell, Gill, et al., 1963Uncertainty assigned by TRC = 0.001 K; Triple point measured in calorimeter with Pt resistance thermometer calibrated against vapor pressure of oxygen.
Ttriple89.79KN/AArmstrong, Brickwedde, et al., 1953Uncertainty assigned by TRC = 0.02 K
Ttriple89.78KN/AClusius and Weigand, 1940Uncertainty assigned by TRC = 0.2 K; see property X for dP/dT for c-l equil.
Ttriple89.3KN/AClusius, Popp, et al., 1937Uncertainty assigned by TRC = 0.6 K
Quantity Value Units Method Reference Comment
Ptriple0.1045atmN/AColwell, Gill, et al., 1963Uncertainty assigned by TRC = 0.000066 atm; Triple point measured in calorimeter with Pt resistance thermometer calibrated against vapor pressure of oxygen.
Ptriple0.1040atmN/AArmstrong, Brickwedde, et al., 1953Uncertainty assigned by TRC = 0.0005 atm
Ptriple0.104atmN/AClusius, Popp, et al., 1937Uncertainty assigned by TRC = 0.001 atm
Quantity Value Units Method Reference Comment
Tc189.2KN/AGrigor and Steele, 1968Uncertainty assigned by TRC = 0.17 K
Quantity Value Units Method Reference Comment
Pc45.99atmN/AGrigor and Steele, 1968Uncertainty assigned by TRC = 0.1799 atm
Quantity Value Units Method Reference Comment
ρc10.19mol/lN/AGrigor and Steele, 1968Uncertainty assigned by TRC = 0.04 mol/l; ~

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

Go To: Top, Phase change data, Vibrational and/or electronic energy levels, References, Notes

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:
LBLHLM - Sharon G. Lias, John E. Bartmess, Joel F. Liebman, John L. Holmes, Rhoda D. Levin, and W. Gary Mallard
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi

Ionization energy determinations

IE (eV) Method Reference Comment
12.658 ± 0.015PIBerkowitz, Greene, et al., 1987LBLHLM
12.83PEBrundle, Robin, et al., 1970RDSH
12.882 ± 0.008PINicholson, 1965RDSH
13.1EIFranklin and Munson, 1965RDSH
12.87 ± 0.02PIDibeler, Krauss, et al., 1965RDSH

Appearance energy determinations

Ion AE (eV) Other Products MethodReferenceComment
CD2+15.25 ± 0.04D2PIDibeler, Krauss, et al., 1965RDSH
CD3+14.38 ± 0.03DPIDibeler, Krauss, et al., 1965RDSH
D+22.2 ± 0.1CD3EILocht, Olivier, et al., 1979LLK

Vibrational and/or electronic energy levels

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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 by: Takehiko Shimanouchi

Symmetry:   Td     Symmetry Number σ = 12


 Sym.   No   Approximate   Selected Freq.  Infrared   Raman   Comments 
 Species   type of mode   Value   Rating   Value  Phase  Value  Phase

a1 1 Sym str 2109  B  ia 2108.9 gas
e 2 Deg deform 1092  B 1092 ia gas 1091.9 gas Observed through Coriolis interaction with ν4
f2 3 Deg str 2259  A 2259.3 gas 2259.3 gas
f2 4 Deg deform 996  B 996.0 gas

Source: Shimanouchi, 1972

Notes

iaInactive
A0~1 cm-1 uncertainty
B1~3 cm-1 uncertainty

References

Go To: Top, Phase change data, Gas phase ion energetics data, Vibrational and/or electronic energy levels, Notes

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

Clusius and Popp, 1940
Clusius, K.; Popp, L., The molar heats, melting heats and heats of transformation of the condensed gases cd(4) and ch(3)d, Z. Phys. Chem., Abt. B, 1940, 46, 63. [all data]

Colwell, Gill, et al., 1963
Colwell, J.H.; Gill, E.K.; Morrison, J.A., Thermodynamic properties of CH4 and CD4. interpretation of the properties of the solids., J. Chem. Phys., 1963, 39, 635-53. [all data]

Armstrong, Brickwedde, et al., 1953
Armstrong, G.T.; Brickwedde, F.G.; Scott, R.B., The Vapor Pressure of the Deuteromethanes, J. Chem. Phys., 1953, 21, 1297. [all data]

Clusius and Weigand, 1940
Clusius, K.; Weigand, K., Melting Curves of the Gases A, Kr, Xe, CH4, CH3D, CD4, C2H4, C2H6, COS, and PH3 to 200 Atmospheres Pressure. The Chane of Volume on Melting, Z. Phys. Chem., Abt. B, 1940, 46, 1-37. [all data]

Clusius, Popp, et al., 1937
Clusius, K.; Popp, L.; Frank, A., Physica (Amsterdam), 1937, 4, 1105. [all data]

Grigor and Steele, 1968
Grigor, A.F.; Steele, W.A., Physical properties of fluid ch(4) and cd(4): experimental, J. Chem. Phys., 1968, 48, 1032-1037. [all data]

Berkowitz, Greene, et al., 1987
Berkowitz, J.; Greene, J.P.; Cho, H.; Ruscic, B., The ionization potentials of CH4 and CD4, J. Chem. Phys., 1987, 86, 674. [all data]

Brundle, Robin, et al., 1970
Brundle, C.R.; Robin, M.B.; Basch, H., Electronic energies and electronic structures of the fluoromethanes, J. Chem. Phys., 1970, 53, 2196. [all data]

Nicholson, 1965
Nicholson, A.J.C., Photoionization-efficiency curves. II. False and genuine structure, J. Chem. Phys., 1965, 43, 1171. [all data]

Franklin and Munson, 1965
Franklin, J.L.; Munson, M.S.B., Ion-molecule reactions in methane-oxygen and acetylene-oxygen systems, Symp. Combust., 10th, Univ. Cambridge, Cambridge, Engl.,, 1965, 1964, 561. [all data]

Dibeler, Krauss, et al., 1965
Dibeler, V.H.; Krauss, M.; Reese, R.M.; Harllee, F.N., Mass-spectrometric study of photoionization. III. Methane and methane-d4, J. Chem. Phys., 1965, 42, 3791. [all data]

Locht, Olivier, et al., 1979
Locht, R.; Olivier, J.L.; Momigny, J., Dissociative autoionization as a mechanism for the proton formation from methane and methane-d4 by low energy electron impact, Chem. Phys., 1979, 43, 425. [all data]

Shimanouchi, 1972
Shimanouchi, T., Tables of Molecular Vibrational Frequencies Consolidated Volume I, National Bureau of Standards, 1972, 1-160. [all data]


Notes

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