University of Chicago Laboratory of Molecular Structure and Spectra Technical Report: 1968 Page: 254
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Captions for Figures
Fig. 1. Spectra of C2H4 and C2D4 in the region 1686 - 1795 A
at room temperature and at two elevated temperatures.
Absorption path 15 cm, gas pressure 50-90 microns Hg.
Fig. 2. Idealised potential energy curves for the R1B3u and
R'1B2g states, plotted as a function of the torsional
angle a (between the planes of the two CH2 groups).
Fig. 3. Torsional selection rules for the R1B3u - A trans-
u g
ition of ethylene. The two electronic states are shown
as if the barriers to internal rotation were low, so that
the internal rotation splittings are resolved; the double
minima in the R state potential function have been omitted.
Full and dotted lines refer to even and odd values of the
rotational quantum number K, repsectively. The classifi-
cation of the levels according to the point group G16(2)
is given in the centre of the diagram.
Fig. 4. Potential energy as a function of the torsional angle a for
the R state of ethylene. The calculated positions of the
first few torsional energy levels for C2H4 and C2D4 are
also shown; only the levels v4' = 0, 1, 2 and 4 in C2H4 and
v4' = 0-4 in C2D4 have actually been observed.254
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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/m1/266/?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.