On the high-energy limits for the double-to-single ionization ratio of helium and helium-like ions in collisions with charged and neutral particles

On the high-energy limit for the ratio o

On the high-energy limit for the ratio of helium double- to single-ionization in collisions with highly charged ions

✍ A.B. Voitkiv; N. Grün; W. Scheid 📂 Article 📅 2000 🏛 Elsevier Science 🌐 English ⚖ 63 KB

The established high-velocity limit of the double-to-single ionization cross-section ratio for helium is f 2.5 = 10 y3 . It was claimed that the highest projectile charge state for which this limit can be reached is around Z s 13. In this Letter we p give some arguments that in ultrarelativistic col