Frequencies of torsional vibrations

The constant intervals indicate harmonic, torsional vibrations of the two phenyl groups.

Energies of the observed bands (ν) and their intervals (Δν) for the vibrational progressions, in cm⁻¹. The quoted values represent the peak position of the various bands. The uncertainties are ±0.5 cm⁻¹.

Progression 1 ν Δν 16949.9 - 17020.0 70.1 17089.9 69.9 17159.1 69.2 17227.4 68.3 17295.3 67.9 17362.9 67.6 17429.5 66.6 17495.4 65.9 17561.0 65.6

Progression 2 ν Δν 17116.8 - 17178.3 61.5 17239.6 61.3 17300.4 60.8 17360.8 60.4 17420.7 59.9 17480.4 59.7 17539.3 58.9 17598.0 58.7

Progression 3 ν Δν 17162.9 - 17233.0 70.1 17303.1 70.1 17372.3 69.2 17441.1 68.8 17509.2 68.1 17576.0 66.8

Progression 4 ν Δν 17268.5 - 17329.8 61.3 17391.0 61.2 17451.7 60.7 17512.0 60.3 17572.0 60.0

Progression 5 ν Δν 17326.8 - 17397.1 70.3 17467.0 69.9 17536.2 69.2 17606.0 69.8

Progression 6 ν Δν 17454.8 - 17515.3 60.5 17576.0 60.7