Strontium monoiodide

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-30.49kJ/molReviewChase, 1998Data last reviewed in June, 1974
Quantity Value Units Method Reference Comment
S°gas,1 bar272.21J/mol*KReviewChase, 1998Data last reviewed in June, 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 37.3686050.21930
B 0.753848-10.18365
C -0.1062693.051128
D 0.034216-0.221890
E -0.040021-6.116715
F -41.80234-56.05430
G 316.9899323.5705
H -30.49404-30.49404
ReferenceChase, 1998Chase, 1998
Comment Data last reviewed in June, 1974 Data last reviewed in June, 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)Sr127I
StateTeωeωexeωeyeBeαeγeDeβereTrans.ν00
F  210.4 H 0.40        F → A or B V 19902.1 H
↳Kamalasanan, 1975
           F → A or B V 19599.3 H
↳Kamalasanan, 1975
D (2Σ) 28944.0 200.4 H 0.50        D → X V 28957.1 H
↳missing citation; Ashrafunnisa, Rao, et al., 1973
C (2Π) 23223.4 168.5 H 0.40        C ↔ X 1 R 23220.6 H
↳Walters and Barratt, 1928; Mesnage, 1939; missing citation
22666.1 170.9 H 0.36        C ↔ X 1 R 22664.5 H
↳Walters and Barratt, 1928; Mesnage, 1939; missing citation
StateTeωeωexeωeyeBeαeγeDeβereTrans.ν00
B (2Σ) 14815.9 2 182.2 H 0.37        B → X 1 V 14820.1 H
↳missing citation
A (2Π) 14748.8 2 179.5 H 0.32        A ↔ X 1 V 14751.7 H
↳Walters and Barratt, 1928; Shukla, 1970; Reddy, Reddy, et al., 1971; missing citation
14422.7 2 182.3 H 0.54        A ↔ X 1 V 14427.0 H
↳Walters and Barratt, 1928; Shukla, 1970; Reddy, Reddy, et al., 1971; missing citation
X 2Σ+ 0 174.1 3 H 0.35 3         

Notes

1Radiative lifetimes measured by Dagdigian, Cruse, et al., 1974: τ(A)= 42 ns, τ(B)= 46 ns, τ(C)= 36 ns. There seems to be some uncertainty concerning the correct identification of the B state emission.
2According to Ashrafunnisa, Rao, et al., 1973, 2 the tentative assignments for these two states or substates (i.e. Σ and Π) should be reversed.
3Average values for the lower state constants of A.. .D → X.
4From a reactive scattering study of the Sr + HI reaction by the crossed molecular beam technique Mims, Lin, et al., 1972. The ionic model calculations of Krasnov and Karaseva, 1965 predict D00 ~ 2.92 eV Krasnov and Karaseva, 1965.

References

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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]

Kamalasanan, 1975
Kamalasanan, M.N., New band system of SrI molecule in the region 4900-5250 Å, Indian J. Pure Appl. Phys., 1975, 13, 124. [all data]

Ashrafunnisa, Rao, et al., 1973
Ashrafunnisa; Rao, D.V.K.; Rao, P.T., A new ultraviolet band system of the SrI molecule, J. Phys. B:, 1973, 6, 2653. [all data]

Walters and Barratt, 1928
Walters, O.H.; Barratt, S., The alkaline earth halide spectra and their origin, Proc. R. Soc. London A, 1928, 118, 120. [all data]

Mesnage, 1939
Mesnage, P., Recherches sur les decharges de haute frequence et leur application a la spectroscopie moleculaire, Ann. Phys. (Paris), 1939, 12, 5. [all data]

Shukla, 1970
Shukla, M.M., Analysis of the A-X band system of the SrI molecule, Indian J. Pure Appl. Phys., 1970, 8, 855. [all data]

Reddy, Reddy, et al., 1971
Reddy, B.R.K.; Reddy, Y.P.; Rao, C.G.R.; Rao, P.T., The spectrum of SrI in the photographic infrared, Curr. Sci., 1971, 40, 186. [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]

Ashrafunnisa, Rao, et al., 1973, 2
Ashrafunnisa; Rao, D.V.K.; Rao, P.T., The band spectrum of SrI in the region λ6500-λ7200 Å, J. Phys. B:, 1973, 6, 1503. [all data]

Mims, Lin, et al., 1972
Mims, C.A.; Lin, S.-M.; Herm, R.R., Crossed beam collision mechanics: reactions of Ca, Sr, and Ba with HI and limits on D0° for CaI, SrI, and BaI, J. Chem. Phys., 1972, 57, 3099. [all data]

Krasnov and Karaseva, 1965
Krasnov, K.S.; Karaseva, N.V., Reevaluation of the spectroscopic dissociation energies of subhalides of the IIa group, Opt. Spectrosc. Engl. Transl., 1965, 19, 14, In original 30. [all data]

Notes

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