D-T/mu and D-L/mu for electrons in NO

Measurements of the ratio of the transverse diffusion coefficient to the mo bility D-T/mu (or the characteristic energy eD(T)/mu) were performed for th e reduced electric field (E/N) from 12 Td to 300 Td(1 Td = 10(-21) V m(2)). The ratio of longitudinal diffusion coefficient to mobility (D-L/mu) is de termined from the fits of the appropriate current ratios obtained from a To wnsend-Huxley experiment as a function of pressure and geometry for a fixed E/N. The results cover a range of moderate E/N and bridge the gap between the two sets of data available in the literature, while covering the range of energies corresponding to the vibrational excitation.