Strontium monobromide

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
ΔfH°gas-89.12kJ/molReviewChase, 1998Data last reviewed in December, 1974
Quantity Value Units Method Reference Comment
S°gas,1 bar263.75J/mol*KReviewChase, 1998Data last reviewed in December, 1974

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. to 1500.1500. to 6000.
A 37.3248448.81096
B 0.732254-8.879703
C -0.1697592.564119
D 0.049331-0.171695
E -0.059857-5.671705
F -100.4796-113.4341
G 308.3721314.0573
H -89.11920-89.11920
ReferenceChase, 1998Chase, 1998
Comment Data last reviewed in December, 1974 Data last reviewed in December, 1974

Constants of diatomic molecules

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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: Klaus P. Huber and Gerhard H. Herzberg

Data collected through September, 1977

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 (88)Sr79Br
StateTeωeωexeωeyeBeαeγeDeβereTrans.ν00
V shaded emission bands in the region 17000 - 20000 cm-1 have been attributed to transitions from three additional states to A 2Π and B 2Σ.
↳Reddy, Reddy, et al., 1971
E 2Σ+ 32052.5 248.0 H 0.65        E → X V 32068.2 H
↳Reddy and Rao, 1966
D 2Σ+ 28958.2 247.8 H 0.55        D ↔ X V 28973.8 H
↳Harrington, 1942; Puri and Mohan, 1975
C 2Π 24665.8 205.2 H 0.49        C ↔ X 1 R 24660.2 H
↳Olmsted, 1906; Harrington, 1942; Joshi and Gopal, 1975; Puri and Mohan, 1975
24343.7 205.2 H 0.49        C ↔ X 1 R 24338.1 H
↳Olmsted, 1906; Harrington, 1942; Joshi and Gopal, 1975; Puri and Mohan, 1975
StateTeωeωexeωeyeBeαeγeDeβereTrans.ν00
B 2Σ+ 15352.0 222.0 H 0.55        B ↔ X 1 V 15354.7 H
↳Hedfeld, 1931; Harrington, 1942
A 2Π 15000.7 222.1 H 0.53        A ↔ X 1 V 15003.5 H
↳Hedfeld, 1931; Harrington, 1942
14699.4 222.1 H 0.53        A ↔ X 1 V 14702.2 H
↳Hedfeld, 1931; Harrington, 1942
X 2Σ+ 0 216.5 H 0.51         

Notes

1The following radiative lifetimes have been measured by Dagdigian, Cruse, et al., 1974: τ(A)= 34 ns, τ(B)= 42 ns, τ(C)= 29 ns.
2Thermochemical value (mass-spectrometry) Hildenbrand, 1977; in good agreement with the flame photometric value of Gurvich, Ryabova, et al., 1973, Khitrov, Ryabova, et al., 1973 but considerably below the lower limit to D00 derived by Menzinger, 1974 from the study of chemiluminescence spectra.

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]

Reddy, Reddy, et al., 1971
Reddy, B.R.K.; Reddy, Y.P.; Ashrafunnisa; Rao, P.T., New electronic transitions in diatomic SrBr molecule, Curr. Sci., 1971, 40, 317. [all data]

Reddy and Rao, 1966
Reddy, Y.P.; Rao, P.T., A new ultraviolet band system of the SrBr molecule, Indian J. Pure Appl. Phys., 1966, 6, 251. [all data]

Harrington, 1942
Harrington, Dissertation, University of California, California, 1942, 0. [all data]

Puri and Mohan, 1975
Puri, S.N.; Mohan, H., Emission spectrum (C-X and D-X systems) of the molecule - SrBr, Curr. Sci., 1975, 44, 152-153. [all data]

Olmsted, 1906
Olmsted, C.M., Die bandenspektra nahe verwandter verbindungen, Z. Wiss. Photogr. Photophys. Photochem., 1906, 4, 293-333. [all data]

Joshi and Gopal, 1975
Joshi, M.M.; Gopal, R., The C(2Π) → X(2Σ+) transition in thermal emission spectra of the diatomic alkaline earth bromides, Pramana, 1975, 4, 276. [all data]

Hedfeld, 1931
Hedfeld, K., Die bandenspektren der erdalkalihalogene, Z. Phys., 1931, 68, 610. [all data]

Dagdigian, Cruse, et al., 1974
Dagdigian, P.J.; Cruse, H.W.; Zare, R.N., Radiative lifetimes of the alkaline earth monohalides, J. Chem. Phys., 1974, 60, 2330. [all data]

Hildenbrand, 1977
Hildenbrand, D.L., Dissociation energies of CaBr, SrBr, BaBr, and BaCl from mass spectrometric studies of gaseous equilibria, J. Chem. Phys., 1977, 66, 3526. [all data]

Gurvich, Ryabova, et al., 1973
Gurvich, L.V.; Ryabova, V.G.; Khitrov, A.N., Determination of dissociation energies of alkaline-earth chlorides, bromides and hydroxides by flame photometry, Faraday Symp. Chem. Soc., 1973, 8, 83. [all data]

Khitrov, Ryabova, et al., 1973
Khitrov, A.N.; Ryabova, V.G.; Gurvich, L.V., Spectrophotometric determination of the dissociation energies of molecules, High Temp. Engl. Transl., 1973, 11, 1005, In original 1126. [all data]

Menzinger, 1974
Menzinger, M., Electronic chemiluminescence in M + X2 reactions: dissociation energies of the alkaline earth monohalides MX (M = Ca, Sr, Ba; X = F, Cl, Br), Can. J. Chem., 1974, 52, 1688. [all data]

Notes

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