C2I2+

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 = 52040 ± 160 gas Heilbronner, Hornung, et al., 1970

State:   C
 Energy 
 (cm-1) 		  Med.   Transition   λmin 
 (nm) 		  λmax 
 (nm) 		  References
To = 41874 ± 160 gas Heilbronner, Hornung, et al., 1970

State:   B
 Energy 
 (cm-1) 		  Med.   Transition   λmin 
 (nm) 		  λmax 
 (nm) 		  References
To = 25334 ± 160 gas Heilbronner, Hornung, et al., 1970

State:   A
 Energy 
 (cm-1) 		  Med.   Transition   λmin 
 (nm) 		  λmax 
 (nm) 		  References
To = 17912 ± 80 gas Heilbronner, Hornung, et al., 1970
Klapstein, Maier, et al., 1983
To = 12971 gas A-X 670 846 Klapstein, Maier, et al., 1983
To = 12987 ± 3 Ne A-X 613 770 Leutwyler, Maier, et al., 1984

State:   A2Πg1/2

Vib. 
sym. 		  No.   Approximate 
 type of mode 		  cm-1   Med.   Method   References
Σg+ 2 CI stretch 195 gas EF Klapstein, Maier, et al., 1983
Πg 4 Bend 224 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 2146 ± 5 Ne AB Leutwyler, Maier, et al., 1984
2 CI stretch 204 gas EF Klapstein, Maier, et al., 1983
2 CI stretch 195 ± 5 Ne AB Leutwyler, Maier, et al., 1984
Πg 4 Bend 225 H T gas EF Klapstein, Maier, et al., 1983
4 Bend 227 ± 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 1990 gas EF Klapstein, Maier, et al., 1983
2 CI stretch 234 gas EF Klapstein, Maier, et al., 1983
Πg 4 Bend 214 H gas EF Klapstein, Maier, et al., 1983
Πu 5 Bend 94 H gas EF Klapstein, Maier, et al., 1983

State:   X2Πu3/2

Vib. 
sym. 		  No.   Approximate 
 type of mode 		  cm-1   Med.   Method   References
Σg+ 2 CI stretch 242 gas EF Klapstein, Maier, et al., 1983
Πg 4 Bend 221 H gas EF Klapstein, Maier, et al., 1983
Πu 5 Bend 101 H gas EF Klapstein, Maier, et al., 1983

Additional references: Jacox, 1994, page 192; 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

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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]

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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