Abstract
The Δv=+2 sequence of the Mulliken system of C2 is reported for the first time. Seven new levels of the D1Σu+ state of C2, v=5 through v=11, were found. The analysis reveals the rotational constants and origin of each band. The numbers are combined with the data reported for previously reported levels, v=0 through v=4, to generate updated Dunham parameters for the D1Σu+ state: ωe=1829.905(57) cm−1, ωexe=14.089(8) cm−1, ωeye=0 cm−1, ωeze=0.00124(3) cm−1, Be=1.83254(46) cm−1, αe=0.01909(18) cm−1and βe=-7.28(14)×10-5 cm−1. The determined equilibrium bond length Re=1.23804(28) Å. The fluorescence lifetimes of the new levels are also reported.
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