Total cross sections for electron scattering by molecular hydrogen

Absolute electron-scattering total cross section measurements for noble gas atoms and diatomic molecules

“…The high accuracy and reliability required for results in hydrogen is partly related to their frequent use for testing models describing processes in gas discharges and plasmas. The present e--H, total cross sections agree well (within 3%) with the data from Pasadena [41] and Amsterdam [66] (below 20eV), constituting once more rather the upper limit of the existing experimental results [ Fig. 2(a), see also Fig.…”

Electron mass stopping power in H2

“…This form of the electron mass STP (19) is consistent with the analysis of Munoz et al [28]. They determined the mean excitation energyĒ from their measured energy-loss spectrum, and obtained the total inelastic cross sections (18) from recommended total scattering cross sections and the values of parameter η obtained from fitting to the data of van Wingerden et al [46]. Note, however, that while Eq.…”

“…5 have been obtained from the parameter η and total cross sections presented in Table 2 of Munoz et al [28]. The parameter η (the ratio of elastic to total scattering cross sections), has been fitted by Munoz et al [28] to a simple function η = exp(−0.511 ln(E i ) + 1.219) using the semiempirical data from van Wingerden et al [46] and utilized in Eq. (19) to obtain the STP.…”

“…(19) to obtain the STP. The data of van Wingerden et al [46] for energies less that 100 eV are based on experimental data of Srivastava et al [51]. The uncertainty in the latter measurements is 18%.…”

Measurements of total cross sections for positrons and electrons colliding with atomic hydrogen

“…2 along with prior measurements [5][6][7][8]. The very good agreement of our present QT's with the prior measurements supports the basic validity of our method for obtaining absolute QT's at all of the investigated energies where f =1n'(Hz)/n(H2) is the degree of dissociation of the H2, while n'(H2) and n(H2) are the number densities of molecular hydrogen in the scattering cell for the discharge on and oA; respectively.…”