Absolute total cross sections for scattering of electrons by H₂O in the energy range 4-20 eV

Abstract

Absolute total cross sections for scattering of electrons by water molecules measured in the 4-20 eV incident energy range using a linear electron transmission device are presented. The results are compared with previous data.

Cross Sections for Electron Collisions with H2O

“…However, due to the lack of a monochromator, the energy resolution was 0.35 eV, hence not allowing discrimination of even vibrational excitation. In fact, their results 40 are slightly (4% at 25 eV) lower than those of Szmytkowski; 35 the difference 41 amounts to 15% at 4 eV. Nishimura and Yano 42 used a similar linear geometry but a short (2.5 mm) scattering cell, which straightforwardly leads to large angular resolution errors: their TCS at 10 eV is 20% lower than that of Szmytkowski.…”

Analytic Cross Sections for Electron Collisions With Co, Co2, and H2o Relevant to Edge Plasma Impurities

“…Measurements of the total scattering cross section (Graph 70) have been reported by Brüche [57], Sueoka et al [58], Szmytkowski [59], Zecca et al [60], and T. SHIRAI, T. TABATA, and H. TAWARA e − + CO, CO 2 , and H 2 O Nishimura and Yano [61]. A recent remeasurement was carried out by Saǧlam and Aktekin [62] with uncertainties ranging from ±1.3 to ±8.3% in the incident energy range 4-20 eV using an attenuation method. All the measurements except for Ref.…”

Recent total cross section measurements in electron scattering from molecules

“…Very recently, Kadokura et al [79] measured TCS in the energy range 3-300 eV, using a high-angular resolution experimental system. Figure 5 shows their TCS results together with some selected previous TCS data [24,67,[80][81][82][83][84] obtained in experiments using electron beams with a poorer angular discrimination. At energies below 8 eV, TCS values of Kadokura et al are distinctly higher, by 10-100%, than all previous measurements.…”

“…Experimental grand-total cross section for electron scattering on water vapors (H2O): ∎ [79]; ◇ [80];▲ [81]; ○ [82];×[67]; +[83,84], •[24].…”