Abstract
A high-resolution gas-phase electronic spectrum has been detected in the 408 nm region using a cw cavity ring-down spectrometer. The absorption band system is observed using a pulsed slit nozzle discharge with a mixture of acetylene in argon. The rotationally resolved spectrum obtained is that of a symmetric top molecule. The determined constants are ν = 24491.0500 (108) and B′′ = 0.14165 (44) cm−1. Consideration of the latter value and ab initio calculations leads to the assignment 3E ← X 3E transition of the linear carbon chain species in the triplet ground electronic state with C3v symmetry.
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