University of Chicago Laboratory of Molecular Structure and Spectra Technical Report: 1968 Page: 238
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parameters (8) and equation (3).
According to equations (3) and (8), the ethylene molecule in the
R state has an equilibrium configuration twisted 250 10 out of plane,
with a potential barrier of 289 20 cm-1 to inversion through the planar
configuration. The first few torsional levels of C2H4 and C2D4 calculated
for this potential are shown in Fig. 4; it is seen that although the mole-
cules are definitely non-planar at equilibrium, they become effectively
planar (though twisting with large amplitude) on excitation of one or two
quanta of the twisting vibration.
The eigenvalues of the matrices for even and odd values of K are
identical to better than 0.001 cm- 1 for the first few upper state twist-
ing levels. This means that no splitting of the bands of the R-N system
due to internal rotation effects is likely to be observable, so that the
double-headed appearance of the bands discussed in Section D has to be a
rotational effect. This provides the justification for the interpretation
given in that section.238
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University of Chicago. Laboratory of Molecular Structure and Spectra. University of Chicago Laboratory of Molecular Structure and Spectra Technical Report: 1968, report, 1969~; Chicago, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc228352/m1/250/?q=green+energy: accessed July 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.