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Frequency-modulated diode laser transient absorption spectra of the ethynylradical have been recorded at wavelengths close to 1.66 $\mu$m. The observedspectrum includes strong, regular, line patterns. The two main bands observedoriginate in the ground $\tilde{X}\,^2\Sigma^+$ state and its first excitedbending vibrational level of $^2\Pi$ symmetry. The upper states, of$^2\Sigma^+$ symmetry at 6055.6 cm$^{-1}$ and $^2\Pi$ symmetry at 6413.5cm$^{-1}$, respectively, had not previously been observed and the data wereanalyzed in terms of an effective Hamiltonian representing their rotational andfine structure levels to derive parameters which can be used to calculaterotational levels up to J = 37/2 for the $^2\Pi$ level and J = 29/2 for the$^2\Sigma$ one. Additionally, a weaker series of lines have been assigned toabsorption from the second excited bending, (020), level of $^2\Sigma$symmetry, to a previously observed state of $^2\Pi$ symmetry near 6819cm$^{-1}$. These strong absorption bands at convenient near-IR laserwavelengths will be useful for monitoring CCH radicals in chemical systems.

The 1.66 $\mu$m Spectrum of the Ethynyl Radical, CCH