Abstract
Abstract High-resolution (Doppler-limited) infrared absorption spectra of the 2601 band of cyclopentadiene (C5H6) have been recorded with FTIR and diode lasers. In addition to room temperature measurements, diode laser spectra were also recorded in a molecular jet. The latter experiments were particularly useful in revealing the low-N transitions in the Q branch. Analysis of 420 P- and R-branch lines of this C-type band, with the ground-state constants fixed at microwave-determined values, yielded rotation and distortion parameters for the upper (261) level. The derived band origin, a ν 0 = 663.84800(5) cm −1 , is in good agreement with that from the vibrational analysis at lower resolution.
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