On the basis of the observed asymmetry of 26 NeI spectral line profiles (in the 3s-3p and 3p-4d transitions) we have obtained their ion broadening parameters (A) caused by influence of ion microfield to the line broadening mechanism. They are the first A data obtained experimentally in the NeI spectrum and 16 from them are the first data in this field. The linear, low-pressure, pulsed arc has been used as a plasma source operated in neon at 33000 and 36500 K electron temperatures and 6.7x10 2 2 and 8.8x10 2 2 m - 3 electron densities. Our A values have been compared to the unique theoretical ones and very high disagreement was found among them. We have found stronger influence of the ion contribution to the NeI line profiles than the semiclassical theoretical approximation provides.