We report a theoretical-experimental investigation of electron scattering by dichloromethane (CH 2 Cl 2) in the low-and intermediate energy ranges. Experimental elastic differential cross sections (DCS), in the incident electron energy range of 0.5-800eV and scattering angle range of 10°-130°, were measured using a crossed beam relative flow technique. Integral and momentumtransfer cross sections were determined from the experimental DCS. Theoretical elastic differential, integral, and momentum-transfer, as well as grand-total, and total absorption cross sections were also calculated for impact energies ranging from 0.5 to 500eV. A complex optical Hartree-Fock potential represented the electron-target interaction and a single-center expansion method combined with a Padé approximation was used to solve the scattering equations. Three resonances: a 2 A 1 C-Cl kσ * resonance centered at about 3.5eV, a 2 B 2 C-Cl kσ * resonance centered at about 5eV and a broad 2 A 1 C-H kσ * resonance at about 10eV were detected in our calculation. Further calculations of DCS were performed at an intermediate energy range of 50-800eV, using the independent-atom model in which the atomic complex optical potential and partial-wave method were used to obtain atomic scattering amplitudes. Comparisons of our experimental and theoretical data with very recent experimental and theoretical results are made.

We report a joint theoretical-experimental investigation on elastic electron scattering by acetone in the low-and intermediate-energy regions. More specifically, experimental differential, integral, and momentum-transfer cross sections are given in the 30-800 eV and 10 • -120 • ranges. Theoretical cross sections are reported in the 1-500 eV interval. The experimental differential cross sections were determined using a crossed electron-beam-molecularbeam geometry, whereas the absolute values of the cross sections were obtained using the relative-flow technique. Theoretically, a complex optical potential derived from a Hartree-Fock molecular wave function was used to represent the collision dynamics, and a single-center expansion method combined with the Padé approximant technique was used to solve the scattering equations. Our experimental cross-section data are in generally good agreement with the present calculated data. Also, our calculated grand-total and total absorption cross sections are in good agreement with the experimental results reported in the literature. Nevertheless, our calculations have revealed a strong shape resonance in the 2 B 2 scattering channel not clearly seen in the experimental results. Possible reasons for this fact are also discussed.

We report a joint theoretical-experimental investigation on elastic electron scattering by dimethyl disulfide (DMDS) in the low-and intermediate-energy regions. Experimental angular distributions of the elastically scattered electrons were measured in the 10-800 eV and 5 • -130 • range using a crossed electron beam-molecular beam geometry. The absolute values of the differential cross sections (DCS) were obtained using the relative-flow technique. Also, integral (ICS) and momentumtransfer (MTCS) cross sections were derived from the experimental DCS via a numerical integration procedure. Theoretically, DCS, ICS, MTCS, grand-total (TCS) and total absorption (TACS) cross sections are reported in the 1-500 eV range. In our calculations, a complex optical potential was used to represent the collision dynamics and a single-center expansion method combined with the Padé approximation was used to solve the scattering equations. Our experimental data are in good agreement with the present calculated data. Comparisons with other theoretical results are also made.

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