Amedo, PabloLeardini, SaraSaá Hernández, ÁngelaGonzález Díaz, Diego2026-04-232026-04-232025-02-14Amedo, Leardini, Saá-Hernández, & González-Díaz. (2025). Primary scintillation yields induced by α particles in gas mixtures of Argon/CF4 at 9.5 bar. European Physical Journal C, 85(2). https://doi.org/10.1140/EPJC/S10052-025-13903-W1434-6044https://hdl.handle.net/10347/46941We report time and band -resolved scintillation from α-particles in Ar/CF4 mixtures at a pressure of 9.5 bar. Our results show that %-level addition of CF4 enables strong wavelength-shifted scintillation in the visible range, with yields at the level of 1000 ph/MeV, scintillation decay times of 9–25 ns and formation times well below 10 ns. Such a performance is a priori sufficient for accurate time-tagging of MeV-particles, without the need to resort to a pure noble gas, thus opening an appealing technological path for next-generation time projection chambers.eng© The Author(s) 2025Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/journal article2026-03-2710.1140/EPJC/S10052-025-13903-W1434-6052open access1434-6052