Ionisation quenching factors from W-values in pure gases for rare event searches

The effect of ionisation quenching for ions is critical experiments relying on the measurement low energy recoils, such as direct Dark Matter searches. We present factor estimates over a range energies protons, $\alpha$-particles, and heavier in H$_{2}$, CH$_{4}$, N$_{2}$, Ar, CO$_{2}$, C$_{3}$H$_{8}$ gases, estimated from respective reference W-value measurements. resulting factors are compared with predictions SRIM.