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There are myriad ions that are deemed too short-lived to be experimentally accessible. One of them is SF 6  + . It has never been observed, although not for lack of trying. We demonstrate that long-lived SF 6  + can be formed by doping charged helium nanodroplets (HNDs) with sulfur hexafluoride; excess helium is then gently stripped from the doped HNDs by collisions with helium gas. The ion is identified by high-resolution mass spectrometry (resolution m /Δ m = 15000), the close agreement between the expected and observed yield of ions that contain minor sulfur isotopes, and collision-induced dissociation in which mass-selected He  n  SF 6  + ions collide with helium gas. Under optimized conditions, the yield of SF 6  + exceeds that of SF 5  + . The procedure is versatile and suitable for stabilizing many other transient molecular ions.

SF6+: Stabilizing Transient Ions in Helium Nanodroplets

SF₆⁺: Stabilizing Transient Ions in Helium Nanodroplets