Laboratory measurements of 50-300Â eV X rays from collisions of cometary interest: Ne and S L X rays, Fe M X rays and others

Laboratory measurements simulating the impact of certain solar wind ions on CO have been made. Preliminary analysis of the X rays in the 50-300 eV energy range produced by these collisions suggests that a dominant role is played by electron capture and subsequent relaxation of the electron to the n = 2 levels of solar wind ions such as Ne and S. In particular our data show that X rays from Ne play a role that is at least as significant as that of the more dominant solar wind ion O6+ in this X-ray energy range. It may be assumed that Mg and Si may also play an important role; however, these ions were not included in the present experiment.