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CH2=C

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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:   ?


 Energy 
 (cm-1
 Med.   Transition   «lambda»min 
 (nm) 
 «lambda»max 
 (nm) 
 References

Tx = 72795 gas Laufer, 1980
Laufer, 1983
Fahr and Laufer, 1985

State:   ?


 Energy 
 (cm-1
 Med.   Transition   «lambda»min 
 (nm) 
 «lambda»max 
 (nm) 
 References

To = 63873 gas Laufer, 1980
Laufer, 1983
Fahr and Laufer, 1985

State:   b


 Energy 
 (cm-1
 Med.   Transition   «lambda»min 
 (nm) 
 «lambda»max 
 (nm) 
 References

To = 22200 ± 160 gas Ervin, Ho, et al., 1989

State:   a


 Energy 
 (cm-1
 Med.   Transition   «lambda»min 
 (nm) 
 «lambda»max 
 (nm) 
 References

To = 16660 ± 50 gas Ervin, Ho, et al., 1989


Vib. 
sym. 
 No.   Approximate 
 type of mode 
 cm-1   Med.   Method   References

a1 1 CH2 s-stretch 2930 ± 10 gas PE Ervin, Ho, et al., 1989
2 C=C stretch 1530 ± 70 gas PE Ervin, Ho, et al., 1989
3 CH2 scissors 1375 ± 10 gas PE Ervin, Ho, et al., 1989

State:   X


Vib. 
sym. 
 No.   Approximate 
 type of mode 
 cm-1   Med.   Method   References

a1 1 CH2 s-stretch 3025 ± 30 gas PE Ervin, Ho, et al., 1989
2 C=C stretch 1635 ± 10 gas PE Burnett, Stevens, et al., 1983
Ervin, Ho, et al., 1989
3 CH2 scissors 1165 ± 10 gas PE Burnett, Stevens, et al., 1983
Ervin, Ho, et al., 1989

Additional references: Jacox, 1994, page 137; Fahr and Laufer, 1986

Notes

oEnergy separation between the v = 0 levels of the excited and electronic ground states.
xEnergy separation between the band maximum of the excited electronic state and the v = 0 level of the ground state.

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.

Laufer, 1980
Laufer, A.H., An excited state of acetylene: Photochemical and spectroscopic evidence, J. Chem. Phys., 1980, 73, 1, 49, https://doi.org/10.1063/1.439846 . [all data]

Laufer, 1983
Laufer, A.H., Quenching of triplet vinylidene radicals by helium, Chem. Phys. Lett., 1983, 94, 2, 240, https://doi.org/10.1016/0009-2614(83)87583-6 . [all data]

Fahr and Laufer, 1985
Fahr, A.; Laufer, A.H., Photodissociation of vinyl chloride: formation and kinetics of vinylidene H2CC(3B2), J. Phys. Chem., 1985, 89, 13, 2906, https://doi.org/10.1021/j100259a039 . [all data]

Ervin, Ho, et al., 1989
Ervin, K.M.; Ho, J.; Linberger, W.C., A Study of the Singlet and Triplet States of Vinylidene by Photoelectron Spectroscopy of H2C=C-, D2C=C-, and HDC=C-. Vinylidene-Acetylene Isomerization, J. Chem. Phys., 1989, 91, 10, 5974, https://doi.org/10.1063/1.457415 . [all data]

Burnett, Stevens, et al., 1983
Burnett, S.M.; Stevens, A.E.; Feigerle, C.S.; Lineberger, W.C., Observation of X1A1 vinylidene by photoelectron spectroscopy of the C2H2- anion, Chem. Phys. Lett., 1983, 100, 124. [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]

Fahr and Laufer, 1986
Fahr, A.; Laufer, A.H., Collisional quenching of excited vinylidene (3B2) radicals, J. Phys. Chem., 1986, 90, 21, 5064, https://doi.org/10.1021/j100412a037 . [all data]


Notes

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