Cross sections for ionization of gases by 10–2000-keVHe+ions and for electron capture and loss by 5–350-keVHe+ions

Cross sections for production of positive and negative charge for 10–2000-keV ${\mathrm{He}}^{+}$ ions on He, Ne, Ar, Kr, ${\mathrm{H}}_2$, ${\mathrm{N}}_2$, CO, ${\mathrm{O}}_2$, ${\mathrm{CH}}_4$, and ${\mathrm{CO}}_2$ were measured by the transverse-field method. Electron-capture and -loss cross sections for 5–350-keV ${\mathrm{He}}^{+}$ ions on the same targets were measured by the method of beam deflection of various charge states after passing through a known length of target gas. Secondary-emission detectors were used to detect neutral, singly charged, and doubly charged beam components. The equation ${\sigma }_{+}$-${\sigma }_{\mathrm{-}}$=${\sigma }_{10}$-${\sigma }_{12}$ relating the four measured cross sections was utilized to make a least-squares adjustment of the data.