The energy losses of ${alpha}$-particle with 3 to 5.4 MeV energy were measured as a function of gas absorber thickness and ${alpha}$-particle energy in three light gaseous media; He, Ar, and $N_2$. The stopping powers and stopping cross-sections were determined by analyzing these data. For Ar gas, the experimental values are very well consistent with the corresponding values of Srivastava's stopping-power theory with the condition of the completely and partially stripped ion. For $N_2$ and He gases, these experimental values express the inconsistencies of about $13{sim}36%$ and $27{sim}28%$, respectively.
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