Absolute di6'erential cross sections of electrons vibrationally elastically scattered from water vapor have been measured at room temperature by electron impact. A modulated crossed-beam method was used. The energy and angular range covered were from 2.2 to 20 eV and from 15' to 150', respectively. Strong backward scattering has been observed as predicted by theory, The measured integrated and momentum-transfer cross sections are generally larger than others in the literature by 50%.
Absolute elastic differential cross sections of atomic hydrogen have been measured by a modulated crossed-beam method. The energy and angular range covered were from 5 to 30 eV and from 12' to 156', respectively. The present results agree with the previous measurements within the experimental uncertainty below 15 eV, but it is found that the present results show stronger backward scattering () 120') than the previous measurement and theoretical results by more than a factor of 2 above 20 eV.
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