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

Iron fluoride


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
Deltafgas47.70kJ/molReviewChase, 1998Data last reviewed in September, 1965
Quantity Value Units Method Reference Comment
gas,1 bar240.31J/mol*KReviewChase, 1998Data last reviewed in September, 1965

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. - 6000.
A 36.63159
B 0.993784
C -0.178892
D 0.015221
E -0.335210
F 35.60981
G 282.4669
H 47.69802
ReferenceChase, 1998
Comment Data last reviewed in September, 1965

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 February, 1975

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 (56)Fe19F
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
C x + (42743) (694) H (7)        C lrarrow (X) V 42751 H
missing citation
           (R) 
Rosen, 1970
           (V) 
Rosen, 1970; missing citation
           (V) 
Rosen, 1970; missing citation
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
(X) x (678) H (7)         

Notes

1Similar in appearance to the B-X2 system of FeCl.
2Similar in appearance to the A-X1 system of FeCl. Additional bands at 29580 cm-1 suggest DeltaG"(1/2) ~ 660 Rosen, 1970.

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]

Rosen, 1970
Rosen, B., International tables of selected constants. 17. Spectroscopic data relative to diatomic molecules, Pub. Pergamon Press, Oxford, 1970, 0. [all data]


Notes

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