Abstract: | TheY2Σ+–X2Πinear-infrared electronic transition of CuO was observed at high resolution for the first time. The spectrum was recorded with the Fourier transform spectrometer associated with the McMath–Pierce Solar Telescope at Kitt Peak. The excited CuO molecules were produced in a low pressure copper hollow cathode sputter with a slow flow of oxygen. Constants for theY2Σ+states of CuO are:T0= 7715.47765(54) cm−1,B= 0.4735780(28) cm−1,D= 0.822(12) × 10−6cm−1,H= 0.46(10) × 10−10cm−1, γ = −0.089587(42) cm−1, γD= 0.1272(79) × 10−6cm−1,bF= 0.12347(22) cm−1, andc= 0.0550(74) cm−1. ImprovedX2Πiconstants are also presented. |