C2Br2+

Vibrational and/or electronic energy levels

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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: Marilyn E. Jacox

State:   D
 Energy 
 (cm-1) 		  Med.   Transition   λmin 
 (nm) 		  λmax 
 (nm) 		  References
To = 58334 ± 160 gas Heilbronner, Hornung, et al., 1970

State:   C
 Energy 
 (cm-1) 		  Med.   Transition   λmin 
 (nm) 		  λmax 
 (nm) 		  References
To = 48168 ± 160 gas Heilbronner, Hornung, et al., 1970

State:   B
 Energy 
 (cm-1) 		  Med.   Transition   λmin 
 (nm) 		  λmax 
 (nm) 		  References
To = 29369 ± 160 gas Heilbronner, Hornung, et al., 1970

State:   A
 Energy 
 (cm-1) 		  Med.   Transition   λmin 
 (nm) 		  λmax 
 (nm) 		  References
To = 22188 ± 80 gas A-X 467 648 Heilbronner, Hornung, et al., 1970
Klapstein, Maier, et al., 1983
To = 19855.9 ± 0.3 gas A-X 438 648 Klapstein, Maier, et al., 1983
Maier and Misev, 1984
Klapstein, Kuhn, et al., 1985
To = 19548 ± 4 Ne A-X 448 511 Leutwyler, Maier, et al., 1984

State:   A2Πg1/2

Vib. 
sym. 		  No.   Approximate 
 type of mode 		  cm-1   Med.   Method   References
Σg+ 2 CBr stretch 278 gas EF Klapstein, Maier, et al., 1983
Πg 4 Bend 257 H T gas EF Klapstein, Maier, et al., 1983
Πu 5 Bend 112 H gas EF Klapstein, Maier, et al., 1983

State:   A2Πg3/2

Vib. 
sym. 		  No.   Approximate 
 type of mode 		  cm-1   Med.   Method   References
Σg+ 1 CC stretch 2190 gas EF LF Klapstein, Maier, et al., 1983
Maier and Misev, 1984
1 CC stretch 2194 ± 5 Ne AB Leutwyler, Maier, et al., 1984
2 CBr stretch 282.7 ± 0.3 gas EF LF Klapstein, Maier, et al., 1983
Maier and Misev, 1984
Klapstein, Kuhn, et al., 1985
2 CBr stretch 293 ± 5 Ne AB Leutwyler, Maier, et al., 1984
Πg 4 Bend 263 H gas EF Klapstein, Maier, et al., 1983
4 Bend 259 ± 5 H Ne AB Leutwyler, Maier, et al., 1984
4 Bend 240 ± 5 H Ne AB Leutwyler, Maier, et al., 1984
Πu 5 Bend 119 H gas EF LF Klapstein, Maier, et al., 1983
Maier and Misev, 1984
5 Bend 135 ± 5 H Ne AB Leutwyler, Maier, et al., 1984
5 Bend 126 ± 5 H Ne AB Leutwyler, Maier, et al., 1984

State:   X2Πu1/2

Vib. 
sym. 		  No.   Approximate 
 type of mode 		  cm-1   Med.   Method   References
Σg+ 1 CC stretch 2065.1 ± 0.3 gas EF Klapstein, Maier, et al., 1983
Klapstein, Kuhn, et al., 1985
2 CBr stretch 318.4 ± 0.3 gas EF Klapstein, Maier, et al., 1983
Klapstein, Kuhn, et al., 1985
Πg 4 Bend 294.5 ± 0.3 H gas EF Klapstein, Maier, et al., 1983
Klapstein, Kuhn, et al., 1985
Πu 5 Bend 132.6 ± 0.3 H gas EF Klapstein, Maier, et al., 1983
Klapstein, Kuhn, et al., 1985

State:   X2Πu3/2

Vib. 
sym. 		  No.   Approximate 
 type of mode 		  cm-1   Med.   Method   References
Σg+ 1 CC stretch 2067.0 ± 0.3 gas EF LF Klapstein, Maier, et al., 1983
Maier and Misev, 1984
Klapstein, Kuhn, et al., 1985
2 CBr stretch 320.7 ± 0.3 gas EF LF Klapstein, Maier, et al., 1983
Maier and Misev, 1984
Klapstein, Kuhn, et al., 1985
Πg 4 Deformation 299.0 ± 0.3 H gas EF LF Klapstein, Maier, et al., 1983
Maier and Misev, 1984
Klapstein, Kuhn, et al., 1985
Πu 5 Deformation 134.9 ± 0.3 H gas EF LF Klapstein, Maier, et al., 1983
Maier and Misev, 1984
Klapstein, Kuhn, et al., 1985

Additional references: Jacox, 1994, page 191; Allan, Kloster-Jensen, et al., 1977; Maier and Thommen, 1982

Notes

H(1/2)(2ν)
TTentative assignment or approximate value
oEnergy separation between the v = 0 levels of the excited and electronic ground states.

References

Go To: Top, Vibrational and/or electronic energy levels, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Heilbronner, Hornung, et al., 1970
Heilbronner, E.; Hornung, V.; Kloster-Jensen, E., Die Photoelektron-Spektren der Dihalogen-acetylene, Helv. Chim. Acta, 1970, 53, 331. [all data]

Klapstein, Maier, et al., 1983
Klapstein, D.; Maier, J.P.; Zambach, W., Emission spectra of rotationally cooled dihaloacetylene cations in the gas phase: A2Π(Ω,g) → x2Π(Ω,u) band systems, Chem. Phys., 1983, 77, 463. [all data]

Maier and Misev, 1984
Maier, J.P.; Misev, L., Spectroscopic characterisation of open-shell cations. Laser excitation spectra of X«58872»C«58876»C«58872»X+ (X = Cl, Br), Int. J. Mass Spectrom. Ion Proc., 1984, 58, 243, https://doi.org/10.1016/0168-1176(84)80032-4 . [all data]

Klapstein, Kuhn, et al., 1985
Klapstein, D.; Kuhn, R.; Maier, J.P., Vibrational frequencies of isotopic species of X-C«58876»C-H+ and X-C«58876»C-X+, X«58875»Cl, Br in the ≈ XΩ and ≈ AΩ Ω = , cationic states, J. Electron Spectrosc. Relat. Phenom., 1985, 35, 1, 171, https://doi.org/10.1016/0368-2048(85)80051-7 . [all data]

Leutwyler, Maier, et al., 1984
Leutwyler, S.; Maier, J.P.; Spittel, U., Electronic absorption spectra of dihaloacetylene cations in neon matrices, Mol. Phys., 1984, 51, 2, 437, https://doi.org/10.1080/00268978400100291 . [all data]

Jacox, 1994
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules, American Chemical Society, Washington, DC, 1994, 464. [all data]

Allan, Kloster-Jensen, et al., 1977
Allan, M.; Kloster-Jensen, E.; Maier, J.P., J. Chem. Soc., 1977, Faraday Trans. 2 73, 1406. [all data]

Maier and Thommen, 1982
Maier, J.P.; Thommen, F., Relaxation of dihaloacetylene cations in their A and B states studied by photoelectron-photoion coincidence spectroscopy, Chem. Phys., 1982, 70, 325. [all data]

Notes

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