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Beryllium


Gas phase thermochemistry 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.

Quantity Value Units Method Reference Comment
Deltafgas637.16kJ/molReviewChase, 1998Data last reviewed in September, 1983
Quantity Value Units Method Reference Comment
gas,1 bar206.39J/mol*KReviewChase, 1998Data last reviewed in September, 1983

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 (J/mol*K)
    H° = standard enthalpy (kJ/mol)
    S° = standard entropy (J/mol*K)
    t = temperature (K) / 1000.

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Temperature (K) 298. - 6000.
A 20.25123
B 0.414567
C -0.106361
D 0.008770
E 0.631136
F 633.2191
G 234.3308
H 637.1604
ReferenceChase, 1998
Comment Data last reviewed in September, 1983

Constants of diatomic molecules

Go To: Top, Gas phase 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: Klaus P. Huber and Gerhard H. Herzberg

Data collected through April, 1976

Symbols used in the table of constants
SymbolMeaning
State electronic state and / or symmetry symbol
Te minimum electronic energy (cm-1)
ωe vibrational constant – first term (cm-1)
ωexe vibrational constant – second term (cm-1)
ωeye vibrational constant – third term (cm-1)
Be rotational constant in equilibrium position (cm-1)
αe rotational constant – first term (cm-1)
γe rotation-vibration interaction constant (cm-1)
De centrifugal distortion constant (cm-1)
βe rotational constant – first term, centrifugal force (cm-1)
re internuclear distance (Å)
Trans. observed transition(s) corresponding to electronic state
ν00 position of 0-0 band (units noted in table)
Diatomic constants for 9Be2
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
A (1Sigmau+)  502 1 6.8        A larrow X 28551 1
Brom, Hewett, et al., 1975
  483 2 4.5        A larrow X 27670 2
Brom, Hewett, et al., 1975
X 1Sigmag+Theoretical calculations give no evidence for a bound ground state Bender and Davidson, 1967.

Notes

1In Ne matrix at 4 K.
2In Ar matrix at 4 K.

References

Go To: Top, Gas phase thermochemistry data, Constants of diatomic molecules, Notes

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

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

Brom, Hewett, et al., 1975
Brom, J.M., Jr.; Hewett, W.D., Jr.; Weltner, W., Jr., Optical spectra of Be atoms and Be2 molecules in rare gas matrices, J. Chem. Phys., 1975, 62, 3122. [all data]

Bender and Davidson, 1967
Bender, C.F.; Davidson, E.R., Theoretical calculation of the potential curves of the Be2 molecule, J. Chem. Phys., 1967, 47, 4972. [all data]


Notes

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