Abstract
The v 3 fundamental and accompanying hot bands of BO2 in the ground electronic state have been observed by a tunable infrared diode laser spectrometer and analysed to yield molecular constants of high precision in the ground, v 3, 2v 3, v 2, and v 2 + v 3 states. The anomalously low fundamental frequency [1278·2585 (4) cm-1] and the large, negative anharmonicity of the v 3 fundamental band are accounted for by a vibronic interaction between [Xtilde] 2Π g and A 2Π u through the v 3 vibration. The observation that the effective B constant is larger in the μ 2Σ than in the κ 2Σ states within the manifold of the v 2 state is explained by higher-order vibration-rotation and Renner-Teller interactions. The analysis leads to a determination of the W 2 parameter of Hougen, 3·87 ± 0·37 cm-1.
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