Energy-Loss Cross Sections for 500 eV Electrons in the Continuum of O2 and CO

Abstract

Energy‐loss cross sections, differential in energy and angle, are presented for 500 eV electrons incident on O₂ and CO in the angular range of 10°–30° for O₂ and 6°–30° for CO. This region of the ionized continuum was studied with an energy resolution $\mathrm{(\Delta \; \epsilon /\epsilon )}$ of 1.5% and an angular resolution of about 1.5°. The cross sections were placed on an absolute scale by normalizing to Bromberg's elastic scattering data. Integration of the differential energy‐loss cross sections over angle yielded energy‐loss cross sections, differential with respect to energy, for O₂ of ${\text{0.078\hspace{0.17em}a}}_0^2/\mathrm{eV}$ at $\text{30\hspace{0.17em}}\mathrm{eV}{\text{,\hspace{0.17em}0.042\hspace{0.17em}a}}_0^2/\mathrm{eV}$ at $\text{50\hspace{0.17em}}\mathrm{eV}{\text{,\hspace{0.17em}0.013\hspace{0.17em}a}}_0^2/\mathrm{eV}$ at 80 eV and ${\text{0.065\hspace{0.17em}a}}_0^2/\mathrm{eV}$ at 100 eV. Corresponding cross sections for CO were ${\text{0.0077\hspace{0.17em}a}}_0^2/\mathrm{eV}$ at 80 eV and ${\text{0.0043\hspace{0.17em}a}}_0^2/\mathrm{eV}$ at 100 eV.