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We report the observation and analysis of spectra in part of thenear-infrared spectrum of C$_2$H, originating in rotational levels in theground and lowest two excited bending vibrational levels of the ground$\tilde{X}\,^2\Sigma^+$ state. In the analysis, we have combined present andpreviously reported high resolution spectroscopic data for the lower levelsinvolved in the transitions to determine significantly improved molecularconstants to describe the fine and hyperfine split rotational levels of theradical in the zero point, $v_2=1$ and the $^2\Sigma^+$ component of $v_2=2$.Two of the upper state vibronic levels involved had not been observedpreviously. The data and analysis indicate the electronic wavefunctioncharacter changes with bending vibrational excitation in the ground state andprovide avenues for future measurements of reactivity of the radical as afunction of vibrational excitation.

Analysis of the $\tilde{A}-\tilde{X}$ bands of the Ethynyl Radical near 1.48$\mu$m and Re-evaluation of $\tilde{X}$ State Energies