High-resolution translational energy loss spectrometry was performed to obtain the spectra for single-electron capture by 6 keV B 2 + ions in collision with CO and NO molecules, to complement a previous investigation involving O 2 and N 2 targets. The spectrum for CO consists of eight well defined peaks, three of which correspond to capture into the ground state of CO + [X 2 Σ + ] dominated by the 0-0 molecular transition. One intense peak and a subsidiary one are identified as capture into the first excited electronic state of CO + , responsible for subsequent emission of the comet-tail system CO + [A 2 Π i → X 2 Σ + ]. The B 2 Σ + state of CO + , the upper electronic state of the Baldet-Johnson [B 2 Σ + → A 2 Σ i ] and the first negative [B 2 Σ + → X 2 Σ + ] bands, is also accessed through two capture channels. The NO spectrum exhibits one intense narrow peak dominated by capture into the second triplet state of NO + [b 3 Π], together with subsidiary features which may involve capture into the ground X 1 Σ + and excited singlet (A 1 Π, A' 1 Σ + , W 1 ∆) and triplet (b 3 Π, a 3 Σ + , b' 3 Σ -) manifolds. The NO spectrum is complicated by energy overlap of relevant capture channels, which makes unambiguous identification difficult.
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