Abstract
The rotational structure of the 2700 Å ( π ∗←π ) transition of m-chlorofluorobenzene is observed and analyzed. Assuming the molecule to be planar in the excited state, the changes in rotational constants are found to be δA=−0.0035cm −1 δB=−0.00044cm −1 The assignment of various observed features are made by the use of Fortrat diagrams. The observed fine structure is composed mainly of subband heads in the qr R branch with some of the less intense features arising from turning points in the qp Q branch. A high frequency wing with is not predicted for a pure A-type transition requires mixing of 10% B-type character to obtain the correct contour. This high frequency wing is composed of coincidences in the rr R branch. The band origin is found to be at 37 026.95±0.05 cm −1.
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