Home Symbol which looks like a small house Up Solid circle with an upward pointer in it

helium

Data at NIST subscription sites:

NIST subscription sites provide data under the NIST Standard Reference Data Program, but require an annual fee to access. The purpose of the fee is to recover costs associated with the development of data collections included in such sites. Your institution may already be a subscriber. Follow the links above to find out more about the data in these sites and their terms of usage.


Gas phase thermochemistry data

Go To: Top, Phase change data, Reaction thermochemistry data, References, Notes

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

Quantity Value Units Method Reference Comment
gas,1 bar30.1513 ± 0.0005cal/mol*KReviewCox, Wagman, et al., 1984CODATA Review value
gas,1 bar30.151cal/mol*KReviewChase, 1998Data last reviewed in March, 1982

Gas Phase Heat Capacity (Shomate Equation)

Cp° = A + B*t + C*t2 + D*t3 + E/t2
H° − H°298.15= A*t + B*t2/2 + C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 − E/(2*t2) + G
    Cp = heat capacity (cal/mol*K)
    H° = standard enthalpy (kcal/mol)
    S° = standard entropy (cal/mol*K)
    t = temperature (K) / 1000.

View plot Requires a JavaScript / HTML 5 canvas capable browser.

View table.

Temperature (K) 298. - 6000.
A 4.967981
B 1.159331×10-10
C -3.783261×10-11
D 3.645079×10-12
E 7.639451×10-12
F -1.481201
G 36.16310
H 0.000000
ReferenceChase, 1998
Comment Data last reviewed in March, 1982

Phase change data

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry data, References, Notes

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
Tc5.2KN/AAngus, de Reuck, et al., 1977Uncertainty assigned by TRC = 0.0005 K; in terms of a temp. scale related to the 1958 He-4 scale, T-58 by 1.001 T-58 + 0.001 K
Quantity Value Units Method Reference Comment
Pc2.244atmN/AAngus, de Reuck, et al., 1977Uncertainty assigned by TRC = 0.002 atm
Quantity Value Units Method Reference Comment
rhoc17.40mol/lN/AAngus, de Reuck, et al., 1977Uncertainty assigned by TRC = 0.01 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:


Reaction thermochemistry data

Go To: Top, Gas phase thermochemistry data, Phase change data, References, Notes

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

Data compiled by: Michael M. Meot-Ner (Mautner) and Sharon G. Lias

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.

Individual Reactions

Lithium ion (1+) + helium = (Lithium ion (1+) bullet helium)

By formula: Li+ + He = (Li+ bullet He)

Quantity Value Units Method Reference Comment
Deltar1.71kcal/molIMobGatland, 1984gas phase
Deltar1.64kcal/molSCATTERINGGislason, 1984gas phase
Deltar1.69kcal/molIMobViehland, 1984gas phase
Deltar1.09kcal/molIMobMason and Sharp, 1958gas phase
Deltar3.16kcal/molIMobTakebe, 1983gas phase

Free energy of reaction

DeltarG° (kcal/mol) T (K) Method Reference Comment
-3.7309.DTColonna-Romano and Keller, 1976gas phase; low E/N

(Nickel ion (1+) bullet 2helium) + helium = (Nickel ion (1+) bullet 3helium)

By formula: (Ni+ bullet 2He) + He = (Ni+ bullet 3He)

Quantity Value Units Method Reference Comment
Deltar1.6 ± 0.2kcal/molSIDTKemper, Hsu, et al., 1991gas phase; «DELTA»rH(0 K) = 1.34 kcal/mol, «DELTA»rS(100 K) = 12.0 cal/mol*K
Quantity Value Units Method Reference Comment
Deltar12.6cal/mol*KSIDTKemper, Hsu, et al., 1991gas phase; «DELTA»rH(0 K) = 1.34 kcal/mol, «DELTA»rS(100 K) = 12.0 cal/mol*K

(Cobalt ion (1+) bullet 2helium) + helium = (Cobalt ion (1+) bullet 3helium)

By formula: (Co+ bullet 2He) + He = (Co+ bullet 3He)

Quantity Value Units Method Reference Comment
Deltar1.3 ± 0.1kcal/molSIDTKemper, Hsu, et al., 1991gas phase; «DELTA»rH(0 K) = 1.22 kcal/mol, «DELTA»rS(100 K) = 11.1 cal/mol*K
Quantity Value Units Method Reference Comment
Deltar11.6cal/mol*KSIDTKemper, Hsu, et al., 1991gas phase; «DELTA»rH(0 K) = 1.22 kcal/mol, «DELTA»rS(100 K) = 11.1 cal/mol*K

(Nickel ion (1+) bullet helium) + helium = (Nickel ion (1+) bullet 2helium)

By formula: (Ni+ bullet He) + He = (Ni+ bullet 2He)

Quantity Value Units Method Reference Comment
Deltar3.7 ± 0.1kcal/molSIDTKemper, Hsu, et al., 1991gas phase; «DELTA»rH(0 K) = 3.42 kcal/mol, «DELTA»rS(100 K) = 19.8 cal/mol*K
Quantity Value Units Method Reference Comment
Deltar20.3cal/mol*KSIDTKemper, Hsu, et al., 1991gas phase; «DELTA»rH(0 K) = 3.42 kcal/mol, «DELTA»rS(100 K) = 19.8 cal/mol*K

(Cobalt ion (1+) bullet helium) + helium = (Cobalt ion (1+) bullet 2helium)

By formula: (Co+ bullet He) + He = (Co+ bullet 2He)

Quantity Value Units Method Reference Comment
Deltar3.7 ± 0.1kcal/molSIDTKemper, Hsu, et al., 1991gas phase; «DELTA»rH(0 K) = 3.41 kcal/mol, «DELTA»rS(100 K) = 19.1 cal/mol*K
Quantity Value Units Method Reference Comment
Deltar19.6cal/mol*KSIDTKemper, Hsu, et al., 1991gas phase; «DELTA»rH(0 K) = 3.41 kcal/mol, «DELTA»rS(100 K) = 19.1 cal/mol*K

Chromium ion (1+) + helium = (Chromium ion (1+) bullet helium)

By formula: Cr+ + He = (Cr+ bullet He)

Quantity Value Units Method Reference Comment
Deltar1.3 ± 0.1kcal/molSIDTKemper, Hsu, et al., 1991gas phase; «DELTA»rH(0 K) = 0.98 kcal/mol, «DELTA»rS(100 K) = 13.3 cal/mol*K
Quantity Value Units Method Reference Comment
Deltar14.8cal/mol*KSIDTKemper, Hsu, et al., 1991gas phase; «DELTA»rH(0 K) = 0.98 kcal/mol, «DELTA»rS(100 K) = 13.3 cal/mol*K

Nickel ion (1+) + helium = (Nickel ion (1+) bullet helium)

By formula: Ni+ + He = (Ni+ bullet He)

Quantity Value Units Method Reference Comment
Deltar3.5 ± 0.1kcal/molSIDTKemper, Hsu, et al., 1991gas phase; «DELTA»rH(0 K) = 2.97 kcal/mol, «DELTA»rS(100 K) = 14.7 cal/mol*K
Quantity Value Units Method Reference Comment
Deltar17.1cal/mol*KSIDTKemper, Hsu, et al., 1991gas phase; «DELTA»rH(0 K) = 2.97 kcal/mol, «DELTA»rS(100 K) = 14.7 cal/mol*K

Cobalt ion (1+) + helium = (Cobalt ion (1+) bullet helium)

By formula: Co+ + He = (Co+ bullet He)

Quantity Value Units Method Reference Comment
Deltar3.6 ± 0.1kcal/molSIDTKemper, Hsu, et al., 1991gas phase; «DELTA»rH(0 K) = 3.02 kcal/mol, «DELTA»rS(100 K) = 14.7 cal/mol*K
Quantity Value Units Method Reference Comment
Deltar17.1cal/mol*KSIDTKemper, Hsu, et al., 1991gas phase; «DELTA»rH(0 K) = 3.02 kcal/mol, «DELTA»rS(100 K) = 14.7 cal/mol*K

(He+ bullet helium) + helium = (He+ bullet 2helium)

By formula: (He+ bullet He) + He = (He+ bullet 2He)

Quantity Value Units Method Reference Comment
Deltar4.2kcal/molDTPatterson, 1968gas phase; corrected for ln T term
Quantity Value Units Method Reference Comment
Deltar18.4cal/mol*KDTPatterson, 1968gas phase; corrected for ln T term

Free energy of reaction

DeltarG° (kcal/mol) T (K) Method Reference Comment
-1.9300.SAMSGusinow, Gerber, et al., 1970gas phase

Sodium ion (1+) + helium = (Sodium ion (1+) bullet helium)

By formula: Na+ + He = (Na+ bullet He)

Quantity Value Units Method Reference Comment
Deltar1.19kcal/molSCATTERINGGislason, 1984gas phase
Deltar0.79kcal/molIMobViehland, 1984gas phase
Deltar0.93kcal/molIMobMason and Sharp, 1958gas phase
Deltar1.38kcal/molIMobTakebe, 1983gas phase

Potassium ion (1+) + helium = (Potassium ion (1+) bullet helium)

By formula: K+ + He = (K+ bullet He)

Quantity Value Units Method Reference Comment
Deltar0.58kcal/molSCATTERINGGislason, 1984gas phase
Deltar0.53kcal/molIMobViehland, 1984gas phase
Deltar0.53kcal/molIMobTakebe, 1983gas phase
Deltar0.57kcal/molIMobRobson and Kumar, 1973gas phase

(He+ bullet 2helium) + helium = (He+ bullet 3helium)

By formula: (He+ bullet 2He) + He = (He+ bullet 3He)

Quantity Value Units Method Reference Comment
Deltar3.73 ± 0.15kcal/molPHPMSHiraoka and Mori, 1990gas phase
Quantity Value Units Method Reference Comment
Deltar17.7cal/mol*KPHPMSHiraoka and Mori, 1990gas phase

Free energy of reaction

DeltarG° (kcal/mol) T (K) Method Reference Comment
0.677.DTHelm, 1976gas phase

(He+ bullet 3helium) + helium = (He+ bullet 4helium)

By formula: (He+ bullet 3He) + He = (He+ bullet 4He)

Quantity Value Units Method Reference Comment
Deltar0.64 ± 0.15kcal/molPHPMSHiraoka and Mori, 1990gas phase
Quantity Value Units Method Reference Comment
Deltar12.8cal/mol*KPHPMSHiraoka and Mori, 1990gas phase

(He+ bullet 4helium) + helium = (He+ bullet 5helium)

By formula: (He+ bullet 4He) + He = (He+ bullet 5He)

Quantity Value Units Method Reference Comment
Deltar0.48 ± 0.15kcal/molPHPMSHiraoka and Mori, 1990gas phase
Quantity Value Units Method Reference Comment
Deltar10.8cal/mol*KPHPMSHiraoka and Mori, 1990gas phase

Nitrogen cation + helium = (Nitrogen cation bullet helium)

By formula: N2+ + He = (N2+ bullet He)

Quantity Value Units Method Reference Comment
Deltar0.4kcal/molPDissBieske, Soliva, et al., 1990gas phase; same «DELTA»rH for N2+(B) and (N2+)X; ab initio, Miller, Tennyson, et al., 1988

He+ + helium = (He+ bullet helium)

By formula: He+ + He = (He+ bullet He)

Quantity Value Units Method Reference Comment
Deltar54.5kcal/molEmSpecDehmer and Pratt, 1982gas phase
Deltar58.8kcal/molSCATTERINGMittman and Weise, 1974gas phase

Cesium ion (1+) + helium = (Cesium ion (1+) bullet helium)

By formula: Cs+ + He = (Cs+ bullet He)

Quantity Value Units Method Reference Comment
Deltar0.36kcal/molSCATTERINGGislason, 1984gas phase
Deltar0.32kcal/molIMobMason and Sharp, 1958gas phase

HN2+ + helium = (HN2+ bullet helium)

By formula: HN2+ + He = (HN2+ bullet He)

Quantity Value Units Method Reference Comment
Deltar1.2kcal/molSCATTERINGMeuwly, Nizkorodov, et al., 1996gas phase

Ne+ + helium = (Ne+ bullet helium)

By formula: Ne+ + He = (Ne+ bullet He)

Quantity Value Units Method Reference Comment
Deltar16.0kcal/molEmSpecDehmer and Pratt, 1982gas phase

Ar+ + helium = (Ar+ bullet helium)

By formula: Ar+ + He = (Ar+ bullet He)

Quantity Value Units Method Reference Comment
Deltar0.60kcal/molEmSpecDehmer and Pratt, 1982gas phase

References

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, Notes

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

Cox, Wagman, et al., 1984
Cox, J.D.; Wagman, D.D.; Medvedev, V.A., CODATA Key Values for Thermodynamics, Hemisphere Publishing Corp., New York, 1984, 1. [all data]

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Angus, de Reuck, et al., 1977
Angus, S.; de Reuck, K.M.; McCarty, R.D., International Thermodynamic Tables of the Fluid State - 4 Helium, Pergamon, New York, 1977. [all data]

Gatland, 1984
Gatland, I.R., Swarms of Ions and Electrons in Gases, W. Lindinger, T. D. Mark and F. Howorka, eds. (Springer, New York, 1984, 1984, 44. [all data]

Gislason, 1984
Gislason, E.A., Quoted in I. R. Gatland in Swarms of Ions and Electrons in Gases, W. Lindinger, T. D. Mark and F. Howorka, eds. (Springer, New York, 1984, 1984, 44. [all data]

Viehland, 1984
Viehland, L.A., Interaction Potentials for Li+ - Rare - Gas Systems, Chem. Phys., 1984, 78, 2, 279, https://doi.org/10.1016/0301-0104(83)85114-3 . [all data]

Mason and Sharp, 1958
Mason, E.A.; Sharp, H.W., Mobility of gaseous lons in weak electric fields, Ann. Phys., 1958, 4, 3, 233, https://doi.org/10.1016/0003-4916(58)90049-6 . [all data]

Takebe, 1983
Takebe, M., The Generalized Mobility Curve for Alkali Ions in Rare Gases: Clustering Reactions and Mobility Curves, J. Chem. Phys., 1983, 78, 12, 7223, https://doi.org/10.1063/1.444763 . [all data]

Colonna-Romano and Keller, 1976
Colonna-Romano, L.M.; Keller, G.E., The Clustering of O2 and He to Li+, J. Chem. Phys., 1976, 64, 6, 2684, https://doi.org/10.1063/1.432522 . [all data]

Kemper, Hsu, et al., 1991
Kemper, P.R.; Hsu, M.T.; Bowers, M.T., Transition - Metal Ion - Rare Gas Clusters: Bond Strengths and Molecular Parameters for Co+(He/Ne)n, Ni+(He/Ne)n, and Cr+(He/Ne/Ar), J. Phys. Chem., 1991, 95, 26, 10600, https://doi.org/10.1021/j100179a022 . [all data]

Patterson, 1968
Patterson, P.L., Evidence of the Existence of an He3+ Ion, J. Chem. Phys., 1968, 48, 8, 3625, https://doi.org/10.1063/1.1669660 . [all data]

Gusinow, Gerber, et al., 1970
Gusinow, M.A.; Gerber, R.A.; Gerardo, J.B., He3+ and He4+ in 300K Helium Plasmas: Their Effect on Recombination Loss of Electrons, Phys. Rev. Lett., 1970, 25, 18, 1248, https://doi.org/10.1103/PhysRevLett.25.1248 . [all data]

Robson and Kumar, 1973
Robson, R.E.; Kumar, K., Mobility and Diffusion II. Dependence on Experimental Variables and Interaction Potential for Alkali Ions in Rare Gases, Aust. J. Phys., 1973, 26, 2, 187, https://doi.org/10.1071/PH730187 . [all data]

Hiraoka and Mori, 1990
Hiraoka, K.; Mori, T., Stability of Rare - Gas Cluster Ions, J. Chem. Phys., 1990, 92, 7, 4408, https://doi.org/10.1063/1.457751 . [all data]

Helm, 1976
Helm, H., The Mobilities and Equilibrium Reactions of Helium Ions in Helium at 77K, J. Phys. B, 1976, 9, 7, 1171, https://doi.org/10.1088/0022-3700/9/7/017 . [all data]

Bieske, Soliva, et al., 1990
Bieske, E.J.; Soliva, A.; Welker, M.A.; Maier, J.P., The B<---X Electronic Spectrum of N2+ He, J. Chem. Phys., 1990, 93, 6, 4477, https://doi.org/10.1063/1.458732 . [all data]

Miller, Tennyson, et al., 1988
Miller, S.; Tennyson, J.; Follmeg, B.; Rosmus, P.; Werner, H., Ab initio Investigation of the Bond Rovibrational States in the Electronic Ground State of HeN2+, J. Chem. Phys., 1988, 89, 4, 2178, https://doi.org/10.1063/1.455062 . [all data]

Dehmer and Pratt, 1982
Dehmer, P.M.; Pratt, S.T., Photoionization of ArKr, ArXe, and KrXe and bond dissociation energies of the rare gas dimer ions, J. Chem. Phys., 1982, 77, 4804. [all data]

Mittman and Weise, 1974
Mittman, H.U.; Weise, H.P., Scattering of Ions V. Elastic Scattering of the Symmetric Rare Gas Ion - Rare Gas Atom Systems, Z. Naturforsch., 1974, A29, 400. [all data]

Meuwly, Nizkorodov, et al., 1996
Meuwly, M.; Nizkorodov, S.A.; Maier, J.P.; Bieske, E.J., Mid-Infrared Spectra of He-HN2+ and He2-HN2+, J. Chem. Phys., 1996, 104, 11, 3876, https://doi.org/10.1063/1.471244 . [all data]


Notes

Go To: Top, Gas phase thermochemistry data, Phase change data, Reaction thermochemistry data, References