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IJPAP Vol.45(09) [September 2007] >


Title: Studies of the nano scale voids and free volume in ⁴⁰Ar ion irradiated solid state nuclear track detector by positron annihilation
Authors: Kumar, Rajesh
Prasad, Rajendra
Keywords: Ion beam modification
Makrofol-N polycarbonate film
Positron annihilation lifetime
Nano scale voids
Free volume
Issue Date: Sep-2008
Publisher: CSIR
IPC CodeH01F41/30, H01L
Abstract: The bombardment of the polymeric materials with Swift Heavy Ions (SHI) results in the change of their free volume properties which have strong correlation with macroscopic properties of the polymeric material. Positron Annihilation Lifetime Spectroscopy (PALS) provides direct information about the dimension, content and hole size distribution of free volume in polymers. Makrofol-N polycarbonate films (40 μm) were irradiated with ⁴⁰Ar ions of energy 14.9 MeV/n to the fluences of 10⁵ ions/cm² from UNILAC, GSI Darmstadt, Germany. The effect of ion irradiation on free volume and characterization by Positron Annihilation Lifetime Spectroscopy (PALS) has been studied. Observed lifetime spectra were resolved into three components and o-Ps lifetime component was associated with the pick off annihilation of positronium trapped by the free volume. The o-Ps lifetime and the average free volume are found to increase on irradiation.
Page(s): 709-713
ISSN: 0019-5596
Source:IJPAP Vol.45(09) [September 2007]

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