Energy and angular distribution of electrons ejected from water by the impact of fast O8+ ion beams

MONTI, JUAN M.; BHATTACHARJEE, SHAMIK; RIVAROLA, ROBERTO D.; BAGDIA, CHANDAN; TRIBEDI, LOKESH C.; CHOWDHURY, MADHUSREE ROY

EUROPEAN PHYSICAL JOURNAL D

SPRINGER

Año: 2018 vol. 72

1434-6060

Abstract. Double differential cross sections (DDCS) of electrons emitted from vapor water molecules (in vapor phase) by 2.0 MeV/u and 3.75 MeV/u bare oxygen ion impact have been measured by continuumelectron spectroscopy technique. The ejected electrons were detected by an electrostatic hemispherical deflection analyzer over an energy range of 1?600 eV and emission angles from 20◦ to 160◦ . The DDCS datahas been compared with the continuum-distorted-wave-eikonal-initial state (CDW-EIS) approximation and a reasonable agreement was found with both version of the models i.e. post and prior version. By numericalintegration of the DDCS data, the single differential cross section (SDCS) and total ionization cross section (TCS) were obtained. The obtained TCS results were compared with other available TCS results for watertarget within the same energy range. The total ionization cross sections values are seen to saturate as the projectile charge state (qp) increases, which is in contrast to the first-Born predicted qp 2 dependence. Thisis also in contrast to the prediction of the CDW-EIS models.