Dependence of hydrogen released on the charge state of incident ions

Abstract

The behavior of polymers under heavy ion bombardment is of great interest. In the present study, hydrogen released from polypropylene (PP) and polyethylene terephthalate (PET) was investigated as a function of charge state (11 + , 14 + , and 25 + ) for 130 MeV 107 Ag ions. It was found that hydrogen released from the polymers varies as αq n , where n was found to be 2.98 and 1.94 for PP and PET, respectively, when compared with the value of ∼3.0 reported in the literature for different polymers and ion combinations. Radii of the damaged zones or ion track formed were deduced from the slope of the hydrogen released versus ion fluence curves. This radius was also found to depend upon the charge state of the incident ion. It varies as βq m , where m is 1.25 and 0.741 for PP and PET, respectively.

Nanoscale Track Diameter and Hydrogen Yield: Dependence upon Charge State of Incident Ion on Polystyrene

“…Halhammer et al [25] also reported the charge state dependence of projectiles guiding through nanocapillaries in PET. If we compare the value of exponent n = 2.1 from the present worked out problem to that reported earlier n = 2.98 for PP (13) we can easily conclude that the chances of hydrogen depletion are less from CH 2 bonds. Fujimoto et al [26] suggested that the hydrogen released as H + from CH or CH 2 may recombine with dangling carbon bonds.…”

“…Heavier elements, molecules and radicals emitted during the ion irradiation were stopped with the help of a polypropylene film of thickness 26 µm kept before the detector. Further experimenttal details can be found in our earlier work [7,13].…”

“…were bombarded with swift heavy ions [11,12]. Similarly when polypropylene (PP) and PET were bombarded with 130 MeV 107 Ag ions, the yield dependence of hydrogen was found to vary as q 2.98 for the PP and q 1.94 for the PET [13]. Bitensky et al [14] developed a model based on Coulomb explosion of the microscopic charge domain around the point of primary ion impact and predicted a q 3 dependence of the H ion yield.…”

<i>γ</i>-Ray Modifications of Optical/Chemical Properties of Polycarbonate Polymer

“…to polymeric substances may be employed frequently to tailor their properties. The exposure of ion beam may create ion tracks in the polymers [1]. In addition to this, the ionizing radiations may also produce random fracture of main chain and braking of original bonds giving rise to the formation of free radicals, double/triple bonds, cross linking [2]- [8], carbon cluster formation [9] [10] and evolution of ionic species and gaseous components etc.…”