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We've performed precise measurements of electron scattering on molecularhydrogen and deuterium by using the "Troitsk nu-mass" setup. Electrons weregenerated by the electron gun with an energy line width better than 0.3 eV. Theelectron energies were 14, 17, 18.7, 19 and 25 keV. The windowless gaseoustritium source (WGTS) was filled by hydrogen isotopes and served as a target.The total column density was adjusted to form a length of 0.35--0.7 of theelectron mean free path. The integral spectrum of scattered electrons wasmeasured by the electrostatic spectrometer with a magnetic adiabaticcollimation and relative energy resolution 8.3 10^{-5}. As a result, the shapesof molecular excitation and ionization spectra were extracted for bothisotopes. We did not find any difference between hydrogen and deuteriumtargets. The relative energy dependence was extracted too.

Electron scattering on hydrogen and deuterium molecules at 14-25 keV by the "Troitsk nu-mass" experiment