Indian Journal of Pure and Applied Physics

http://www.niscair.res.in

Total visitors: 323  since 31-10-07

 

Volume 45

Number 9

SEPTEMBER 2007

CODEN : IJOPAU 45(9) 705-774

ISSN : 0019-5596

 

 

CONTENTS

Nuclear Physics

 

Studies of the nano scale voids and free volume in 40Ar ion irradiated solid state nuclear track detector by positron annihilation

709

Rajesh Kumar* & Rajendra Prasad

 

Atomic and Molecular Physics

 

Theoretical and experimental studies of vibrational spectra of naphthalene and its cation

714

Alka Srivastava & V B Singh*

 

Pressure-volume-temperature relationship for diatomic solids based on inverted and non-inverted equations of state

721

S Digpratap, K Sushil & B P Singh*

 

Electromagnetism, Optics, Acoustics, Heat Transfer, Classical Mechanics and Fluid Dynamics

 

Comparative study of compressibilities of ternary liquid systems from two liquid state model at 298.15 K

726

R K Shukla*, Atul Kumar, Kirti Srivastava & Shilpi Yadav

 

Viscosity of eutectic silumin alloy in ultrasonic field and estimation of melting temperature

733

Luminita Moraru

 

Physics of Gases, Plasmas and Electric Discharges

 

Temperature dependent positron annihilation in one dimensional weakly coupled one component plasma

738

S P Tewari*, Jyoti Sood & Grima Dhingra

 

Condensed Matter: Structure, Mechanical and Thermal Properties

 

Synthesis and characterization of BaTiO3 and LiNbO3 ceramic powders

741

A Sreenivasulu, T N V K V Prasad  & S Buddhudu*

 

Evaluation of thermal performance of heat exchanger unit for parabolic solar cooker for off-place cooking

745

V V S Murty*, A Gupta, N Mandloi & A Shukla

 

Condensed Matter: Electronic Structure, Electrical, Magnetic, and Optical Properties

 

Dielectric study of spin coated nano-thick BaZrxTi1-xO3 film

749

S K Rout*, T Badapanda & S Panigrahi

 

Dielectric studies of methyl methacrylate and butyl methacrylate with primary alcohols using time domain reflectometry

754

F Liakath Ali Khan*, P Sivagurunathan, S Raja Mohamed Kamil & S C Mehrotra

 

Dielectric relaxation studies of binary mixtures of N-methylacetamide and N, N-dimethylacetamide in benzene solutions using microwave absorption data

759

Raman Kumar, V S Rangra*, D R Sharma, Nagesh Thakur & N S Negi

 

Effect of Ag+-addition on elastic behaviour of Bi-2212 superconductors

764

M B Solunke, K B Modi*, V K Lakhani, K B Zankat, P U Sharma, P V Reddy & S S Shah

 

Interdisciplinary Physics and Related Areas of Science and Technology

 

 

Current-mode multifunction filter using current differencing transconductance amplifier

767

N A Shah*, Munazah Quadri & S Z Iqbal

 

___________

*The corresponding author has been indicated by (*) mark in case of papers with more than one author.

 

 


Indian Journal of Pure & Applied Physics

Vol. 45, September 2007, pp. 709-713

 

Studies of the nano scale voids and free volume in 40Ar ion irradiated solid state nuclear track detector by positron annihilation

 

Rajesh Kumar* & Rajendra Prasad

Department of Applied Physics, Z H College of Engineering & Technology, Aligarh Muslim University, Aligarh 202 002

Received 16 November 2006; accepted 10 July 2007

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.

Keywords: Ion beam modification, Makrofol-N polycarbonate film, Positron annihilation lifetime, Nano scale voids, Free volume

IPC Code: H01F41/30, H01L

Indian Journal of Pure & Applied Physics

Vol. 45, September 2007, pp. 714-720

Theoretical and experimental studies of vibrational spectra of
naphthalene and its cation

 

Alka Srivastava* & V B Singh

Department of Physics, Udai Pratap Autonomous College, Varanasi 221 002

Received 8 January 2007; revised 22 June 2007; accepted 5 July 2007

Raman and FTIR spectra of naphthalene and its cation have been systematically analyzed using ab-initio and density functional theory calculations. The optimized geometries, harmonic vibrational wave numbers and intensity of vibrational bands of naphthalene and its cation were calculated invoking different basis sets up to HF/6-311++G** and B3LYP/6-311++G** level. Vibrational assignments have been made and calculated DFT frequencies and intensities of the naphthalene and its cation at B3LYP/6-311++G** levels and are found to be in better agreement with corresponding experimental values in comparison to previous results. The experimental and theoretical studies of neutral and ionized naphthalene have revealed an unexpected effect of the ionization on the vibrational spectra that lead to a dramatic reduction in intensities of CH stretching modes and concurrently large increase in the intensities of ring CC stretching and CH bending vibrations.

Keywords: Ab-initio, DFT calculations, FTIR, Raman spectra, Vibrational mode frequencies, Naphthalene and its cation

IPC Code: G01J3/28

Indian Journal of Pure & Applied Physics

Vol. 45, September 2007, pp. 721-725

Pressure-volume-temperature relationship for diatomic solids based on inverted and non-inverted equations of state

S  Digpratap, K  Sushil & B P  Singh

Department of Physics, Institute of Basic Sciences, Khandari, Agra 282 002

*E-mails: drbps.ibs@gmail.com

Received 7 December 2006; revised 11 July 2007; accepted 16 July 2007

The pressure-volume-temperature (P-V-T) relationship using inverted and non-inverted equations of state (EOS) for diatomic solids such as NaCl, MgO and LiH has been studied. It is found that the inverted type EOS due to Roy and Roy [Physica B, 350 (2004) 1945.] yields close agreement with the results obtained from the non-inverted equations due to Rydberg [J Phys, 73 (1932) 376.], Shanker et al.[Physica B, 271 (1999) 158], Hama and Suito [J Phys, 8 (1996) 67.] for isothermal compressions as well as isothermal bulk modulus. The Roy - Roy inverted EOS has been found to have an additional advantage of predicting volumes for a solid at simultaneously elevated pressure and temperature. We have used this EOS to obtain P-V-T results for NaCl and MgO. The calculated values present close agreement with the experimental data.

Keywords:   Equations of state, Bulk modulus, P-V-T relationship,  Diatomic solids

Indian Journal of Pure & Applied Physics

Vol. 45, September 2007, pp. 726-732

Comparative study of compressibilities of ternary liquid systems from two liquid state model at 298.15 K

R K Shukla, Atul Kumar, Kirti Srivastava & Shilpi Yadav*

Department of Chemistry, V.S.S.D.College, Kanpur 208 002

*Department of Physics, DAV College, Kanpur

Received 24 January 2007; revised 20 June 2007; accepted 10 July 2007

Isothermal and adiabatic compressibility of three liquid ternary : toluene + cyclohexane + carbon tetrachloride, benzene + cyclohexane + toluene and carbon tetrachloride + cyclohexane + benzene and its nine contributory binaries were estimated using two liquid state models; Flory statistical theory (FST) and Bertrand-Acree-Bruchfield (BAB) over a wide range of composition. Excess compressibilities deduced from these models were also estimated in order to study the nature and extent of molecular interactions involved therein. The theoretical results so obtained from the two liquid state models have been compared.

Keywords: Ternary liquid systems, Isothermal, Adiabatic compressibility, Two liquid state model

IPC Code: B06B