Angular distributions of electrons elastically scattered from ${\mathrm{O}}_2$ have been measured by a crossed-beam method. The energy and angular range measured were from 2.0 to 200 eV and from -96° to + 156°, respectively. Total elastic and momentum-transfer cross sections have been obtained and compared with the previous measurements. It is found that there are discrepancies among the measurements in the total elastic cross sections and a serious discrepancy with previous measurements in the momentum-transfer cross sections.

• Received 26 October 1981

DOI:https://doi.org/10.1103/PhysRevA.26.1369