Capture and loss correlated to x-ray emission in O$^{5+}$ on Ar collisions

K x rays emitted from projectile and target atoms correlated to projectile capture and loss charge states were investigated for 18 and 25 MeV O$^{5+}$ on Ar collisions. Single capture coincidences are of interest as they translate to a target electron transferred to the projectile ion causing excitation followed by x-ray emission. Such a process is the signature for resonant charge transfer and excitation followed by x-ray emission (RTEX). We plan to cover the energy range for such RTEX cross sections. Heavy targets like Ar are not commonly used so we seek to test RTE theory for such targets. It is also planned to run for O$^{7+}$ to increase the capture probability. We are planning to measure single loss coincidences as well so we can study projectile ionization associated with projectile and target K-x-ray emission. In the case of Li-like O, K emission correlated with O$^{6+}$ can be obtained by K-shell ionization accompanied by 2s $\to $ 2p (or higher) excitation followed by a 2p $\to $1s decay, or the same emission line can be obtained from K-shell excitation to 2p (or higher) accompanied by ionization of the 2s electron. On the other hand, Ar K emission can be obtained by K-shell ionization followed by 2p $\to $1s or 3p $\to $1s decay, or possibly by K-shell excitation to 3d or higher levels.