A study of the structure and dynamics of the hydronium ion by high resolution infrared laser spectroscopy. III. The ν3 band of D3O+ J. Chem. Phys. 92, 3257 (1990); 10.1063/1.457884 Infrared spectroscopy of carboions. V. Classical vs nonclassical structure of protonated acetylene C2H+ 3 J. Chem. Phys. 91, 5139 (1989); 10.1063/1.457612 Infrared spectroscopy of carboions. IV. The A 2Π u -X 2Σ+ g electronic transition of C− 2 J. Chem. Phys. 89, 129 (1988); 10.1063/1.455731Infrared spectra of carboions. II. ν3 band of acetylene ion C2H+ 2(2Π u )

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The vibration-rotation infrared spectrum of the ν3 fundamental band of the methyl cation CH+3 has been observed using a difference frequency laser system. The analysis of the spectrum demonstrates the D3h symmetry of the ion. This work marks the beginning of high resolution spectroscopy of simple polyatomic hydrocarbon cations.

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