Abstract
The gas-phase absorption spectrum of the ν3 band of cyclopropenylidene (cyclic C3H2 ) has been observed with a high-resolution Fourier transform infrared spectrometer. The ring molecule was generated by a microwave discharge in an allene and Ar mixture. The spectrum observed between 1250 and 1305 cm−1 was analyzed by using Watson’s A-reduced Hamiltonian to determine the band origin (ν0=1277.3711±0.0001 cm−1 ), rotational constants, and centrifugal distortion constants in the ν3 state.
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