Absorption effects in intermediate-energy electron scattering by hydrogen sulphide

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)In this work, we present a joint theoretical-experimental study on elastic electron-H(2)S collisions in the low- and intermediate-energy range. Absolute differential cross sections have been measured for energies in the 30-100 eV range over scattering angles between 10 degrees and 180 degrees, using a crossed-beam electron spectrometer combined with a magnetic angle-changing device to extend the measurements to backward angles. In addition, differential, integral and momentum-transfer cross sections as well as total and absorption cross sections are calculated and reported for energies ranging from 1 to 500 eV. A complex optical potential was used to represent the electron-molecule interaction dynamics. The iterative Schwinger variational method combined with the distorted-wave approximation was used to solve the scattering equations. The comparison between our calculated and measured results, as well as with other experimental and theoretical data available in the literature, is encouraging.4118Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Korean agency KOSEF [R01-2007-000-10034-0]Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)Korean agency KOSEF [R01-2007-000-10034-0