Beschreibung:
Gas mixtures of He and CO were excited by electron beams. The transient species CO+(X,A,B), CO(A,C,a,b), C2(X,d), C*(3s) and O*(3p5P) were identified by fluorescence and absorption measurements. The time dependence and absolute population yield for most of these species were determined. Based on these results a reaction scheme is proposed which reproduces the experimental data quantitatively. Optical gain, previously observed by Waller et al. [Appl. Phys. Lett. 27, 323 (1975)] on the CO+(B)→CO+(X) transition was not reproduced.