  We've performed precise measurements of electron scattering on molecular
hydrogen and deuterium by using the "Troitsk nu-mass" setup. Electrons were
generated by the electron gun with an energy line width better than 0.3 eV. The
electron energies were 14, 17, 18.7, 19 and 25 keV. The windowless gaseous
tritium 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 the
electron mean free path. The integral spectrum of scattered electrons was
measured by the electrostatic spectrometer with a magnetic adiabatic
collimation and relative energy resolution 8.3 10^{-5}. As a result, the shapes
of molecular excitation and ionization spectra were extracted for both
isotopes. We did not find any difference between hydrogen and deuterium
targets. The relative energy dependence was extracted too.
