Soft X-ray emissions related to the solar wind charge exchange observed by the X-ray satellite observatories

We have observed the emission spectra in collisions of bare and hydrogen-like C and O ions with helium atoms and hydrogen molecules as target gases in the soft X-ray region using a window-less Si(Li) detector at collision energies around 100 keV. Because it is found that the 1s-2p emission is dominant in each spectrum, we indicate that the cascade from the upper states give the large population of the 2p state after the consideration using state-selective capture cross sections calculated by the TC-AOCC method.