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Absolute cross sections are measured for charge-exchange, ionization, andexcitation within the same experimental setup for the Li$^{+}-$Ar, K$^{+}-$ Ar,and Na$^{+}-$ He collisions in the ion energy range $0.5-10$ keV. Results ofour measurements along with existing experimental data and the schematiccorrelation diagrams are used to analyze and determine the mechanisms for theseprocesses. The experimental results show that the charge-exchange processes arerealized with high probabilities and electrons are predominately captured inground states. The cross section ratio for charge exchange, ionization andexcitation processes roughly attains the value $10:2:1$, respectively. Thecontributions of various partial inelastic channels to the total ionizationcross sections are estimated and a primary mechanism for the process isdefined. The energy-loss spectrum, in addition, is applied to estimate therelative contribution of different inelastic channels and to determine themechanisms for the ionization and for some excitation processes of Ar resonancelines for the K$^{+}-$Ar collision system. The excitation function for thehelium, as well as for the sodium doublet lines for the Na$^{+}-$He collisionsystem, reveals some unexpected features and a mechanism to explain thisobservation is suggested.

Charge-exchange, ionization and excitation in low-energy Li$^{+}-$ Ar, K$^{+}-$ Ar, and Na$^{+}-$He collisions