Magnesium bromide

Gas phase thermochemistry data

Go To: Top, Constants of diatomic molecules, 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
ΔfH°gas-35.34kJ/molReviewChase, 1998Data last reviewed in June, 1975
Quantity Value Units Method Reference Comment
S°gas,1 bar244.94J/mol*KReviewChase, 1998Data last reviewed in June, 1975

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.

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

View table.

Temperature (K) 298. to 6000.
A 37.10756
B 0.928409
C -0.215556
D 0.034077
E -0.154394
F -46.96247
G 288.7148
H -35.34204
ReferenceChase, 1998
Comment Data last reviewed in June, 1975

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 March, 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 24Mg(79)Br
StateTeωeωexeωeyeBeαeγeDeβereTrans.ν00
R shaded bands in the region 36800 - 39400 cm-1 have been variously attributed to a 2Π ← X 2Σ transition Harrington, 1942 or to a 2Σ ← X 2Σ Reddy and Rao, 1970; ω'e ~ 223 or 272 cm-1 respectively.
A 2Π 25877 393.9 H 2.04  [(0.1685)] 1 2     [(2.332)] A ↔ X V 25887 H
↳Olmsted, 1906; Morgan, 1936; Harrington, 1942; Puri and Mohan, 1974
25766.9 393.9 H 2.04  [(0.1685)] 1 2     [(2.332)] A ↔ X V 25776.8 H
↳Olmsted, 1906; Morgan, 1936; Harrington, 1942; Puri and Mohan, 1974
X 2Σ+ 0 373.8 H 1.34  [(0.1645)] 1     [(2.360)]  

Notes

1Partial rotational analysis of the 0-0 band Patel and Patel, 1969.
2Predissociation above v=3.
3From the predissociation in A 2Π.

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]

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

Reddy and Rao, 1970
Reddy, B.R.K.; Rao, P.T., The electronic emission spectrum of the MgBr molecule, Curr. Sci., 1970, 39, 509. [all data]

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

Morgan, 1936
Morgan, F., Band spectra of MgCl, MgBr and MgI in absorption, Phys. Rev., 1936, 50, 603. [all data]

Puri and Mohan, 1974
Puri, S.N.; Mohan, H., Thermal emission spectrum of the molecule - MgBr, Curr. Sci., 1974, 43, 442. [all data]

Patel and Patel, 1969
Patel, M.M.; Patel, P.D., Rotational analysis of the (0,0) bands of the A2Π → X2Σ+ system of MgBr, J. Phys. B:, 1969, 2, 515. [all data]

Notes

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