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Bromosilylidyne


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
Deltafgas235.33kJ/molReviewChase, 1998Data last reviewed in December, 1976
Quantity Value Units Method Reference Comment
gas,1 bar247.51J/mol*KReviewChase, 1998Data last reviewed in December, 1976

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 38.74325
B -0.367810
C 0.160193
D 0.006464
E 0.018122
F 223.8737
G 294.6009
H 235.3253
ReferenceChase, 1998
Comment Data last reviewed in December, 1976

Gas phase ion energetics data

Go To: Top, Gas phase thermochemistry data, 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.

Data compiled as indicated in comments:
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

View reactions leading to BrSi+ (ion structure unspecified)

Ionization energy determinations

IE (eV) Method Reference Comment
9. ± 1.EIFarber and Srivastava, 1980LLK
7.3SKuznetsova, Kuzmenko, et al., 1968RDSH

Constants of diatomic molecules

Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics 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 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 (28)Si(79)Br
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
Fragments of two other emission systems (30100 - 31500, 34900 - 36900 cm-1) tentatively assigned to SiBr or SiBr+.
Asundi and Karim, 1938
Additional absorption bands at 45762, 46266, 46343, 46693, 47445 cm-1.
Oldershaw and Robinson, 1971
(F)  [505] $aH         (F) larrow X 45017 H
Oldershaw and Robinson, 1971
E (44560) 552 H 1.5 1        E larrow X V (44201) )H
Oldershaw and Robinson, 1971
44521 552 H 1.5 1        E larrow X V 44585 H
Oldershaw and Robinson, 1971
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
D 44017 [565] $bH         D larrow X V 44088 H
Oldershaw and Robinson, 1971
C (2Pi) 41060 531 $cH 2.0        C larrow X V 40690 $cH
Oldershaw and Robinson, 1971
41051 531 $cH 2.0        C larrow X V 41104 $cH
Oldershaw and Robinson, 1971
B (2Sigma) 33572.4 571.2 H 2.4  2 3      B lrarrow X V 33223.1 H
missing citation; Jevons and Bashford, 1937; Kuznetsova, Kuz'menko, et al., 1968; Oldershaw and Robinson, 1971
33572.4 571.2 H 2.4  2 3      B lrarrow X V 33645.1 H
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
B' (2Delta) 23911 395 H 4        B' rarrow X R 23473 HQ
Kuznetsova and Kuzyakov, 1969
23889 395 H 4        B' rarrow X R 23874 HQ
Kuznetsova and Kuzyakov, 1969
A (2Sigma) 20937.6 250.3 H 0.5        A rarrow X R (20428)
Kuznetsova and Kuzyakov, 1969; Rao and Haranath, 1969
20937.6 250.3 H 0.5        A rarrow X R 20850.9 H
Kuznetsova and Kuzyakov, 1969; Rao and Haranath, 1969
StateTeomegaeomegaexeomegaeyeBealphaegammaeDebetaereTrans.nu00
X 2Pir 423.1 4 424.3 H 1.5  3       
0 424.3 H 1.5  3       

Notes

1Bands with v'=1 and 2 are diffuse.
2Emission bands with v'>2 have not been observed.
3 Kuznetsova and Kuzyakov, 1969, 2 report the following rotational constants for the B-X bands: B'0 = 0.1771 Kuznetsova and Kuzyakov, 1969, 2, B"0(2Pi1/2) = 0.1598 Kuznetsova and Kuzyakov, 1969, 2. See also Mishra and Khanna, 1972 who give considerably different results.
4From Kuznetsova, Kuz'menko, et al., 1968; Jevons and Bashford, 1937 prefer a doublet separation of 418.0 cm-1 leading to slightly different constants.
5Only two bands; it is not certain that they belong to the same system.
6It is possible that the v'=1 progression is in fact a separate system D' larrow X.
7Vibrational numbering uncertain.
8Br isotope shifts clearly observed.

References

Go To: Top, Gas phase thermochemistry data, Gas phase ion energetics 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]

Farber and Srivastava, 1980
Farber, M.; Srivastava, R.D., Mass spectrometric determination of the heats of formation of the silicon bromides SiBr(g), SiBr2(g), and SiBr3(g)., High Temp. Sci., 1980, 12, 21. [all data]

Kuznetsova, Kuzmenko, et al., 1968
Kuznetsova, L.A.; Kuzmenko, N.E.; Kuzyakov, Y.Y., Emission spectrum of the SiBr+ molecule, Opt. Spectrosc., 1968, 24, 434, In original 812. [all data]

Asundi and Karim, 1938
Asundi, R.K.; Karim, S.M., On the emission spectrum of SiBr4, Proc. Indian Acad. Sci. Sect. A, 1938, 6, 281. [all data]

Oldershaw and Robinson, 1971
Oldershaw, G.A.; Robinson, K., Ultra-violet spectrum of SiBr, Trans. Faraday Soc., 1971, 67, 1870. [all data]

Jevons and Bashford, 1937
Jevons, W.; Bashford, L.A., Ultra-violet band systems of SnBr and SiBr, Proc. Phys. Soc. London, 1937, 49, 554. [all data]

Kuznetsova, Kuz'menko, et al., 1968
Kuznetsova, L.A.; Kuz'menko, N.E.; Kuzyakov, Yu.Ya., Analysis of the vibrational structure of the SiBr emission spectrum, Moscow Univ. Chem. Bull. Engl. Transl., 1968, 23, 18, In original 30. [all data]

Kuznetsova and Kuzyakov, 1969
Kuznetsova, L.A.; Kuzyakov, Yu.Ya., Emission spectrum of a glow discharge in SiBr4 vapor, J. Appl. Spectrosc. Engl. Transl., 1969, 10, 278, In original 413. [all data]

Rao and Haranath, 1969
Rao, K.B.; Haranath, P.B.V., The emission band spectrum of SiBr in the visible region, J. Phys. B:, 1969, 2, 1381. [all data]

Kuznetsova and Kuzyakov, 1969, 2
Kuznetsova, L.A.; Kuzyakov, Yu.Ya., Rotational analysis of the 2«SIGMA»-2«PI» band system of the spectrum of the SiBr molecule, Moscow Univ. Chem. Bull. Engl. Transl., 1969, 24, 74, In original 103. [all data]

Mishra and Khanna, 1972
Mishra, R.K.; Khanna, B.N., Emission spectrum of the SiBr molecule, Indian J. Phys., 1972, 46, 1. [all data]


Notes

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