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Indian Journal of Pure and Applied Physics

 

ISSN: 0019-5596   CODEN:IJOPAU 41(11) 825-900(2003) 
VOLUME 41

  NUMBER 11 

 NOVEMBER   2003

 

CONTENTS

 

 

Nuclear Physics

Measurement and analysis of excitation functions for alpha induced reactions with rubidium

Avinash Agarwal, M K Bhardwaj, I A Rizvi & A K Chaubey*

 

829

 

Atomic and Molecular Physics

Application of FTIR and Mössbauer spectroscopy in analysis of some South Indian  archeological potteries

R Venkatachalapahty*, D Gournis, C Manoharan, S Dhanapandian & K Deenadayalan

 

 

833

 

Fourier transform infrared spectrum and normal coordinate analysis of chloroxylenol

S Gunasekaran* & R Rajkumar

839

 

Vibrational analysis of some pyrazole derivatives

T Chithambarathanu, V Umayorubaghan & V Krishnakumar*

844

 

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

Ultrasonic study at molecular interactions in binary liquid mixtures: acrolien & cinnamaldehyde in methanol, cyclohexane & p-dioxane

V D Bhandakkar*, V A Tabhane & Sharda Ghosh

 


849

 

Ultrasonic study of binary mixture of DIBK (di-isobutylketone) with polar liquids

S Acharya* , R Paikray & G S Mohanty

855

 

Condensed Matter: Structural, Mechanical and Thermal Properties

NMR spin lattice relaxation investigation of some molecular systems and its correlation with dielectric relaxation

S K Vaish, A K Singh, Anupam Singh & N K Mehrotra*




858

 

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

Electrical transport in amorphous GE14 Se86-xTl x system

A M Ahmed*, N M Megahid & M M Ibrahiem



 

 

863

 

Photoluminescence of CulnTe2 films prepared by annealing of stacked elemental layers

P Guha, S Roy, A K Pal & S Chaudhuri*

869

 

Solvent effect on linear correlation factor and dielectric relaxation time of butyl alcohol

N Srinivasan, S Kumar* & S Krishnan

876

A JAVA program for designing synchronously tuned extended cavity diode laser in
Littrow configuration

Sarika Pugla & Santa Chawla*


879

 

Interdisciplinary Physics and Related Areas of Science and Technology

Theoretical approach to lyoluminescence of organic materials

B P Chandra*, Anubha S Gour, Vivek K Chandra, D S Baghel & P K Khare

 

 

884

 

Decay behaviour of CaS phosphors activated by Ce3+, Na+ and Cu+

Manoj Tiwari*, Vijay Singh, S J Dhoble & O N Awasthi

894

____________

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

 

 

 

 

Indian Journal of Pure & Applied Physics

Vol. 41, November 2003, pp. 829-832

 

 

Measurement and analysis of excitation functions
for alpha induced reactions with rubidium

Avinash Agarwal*, M K Bhardwaj, I A Rizvi & A K Chaubey#

 

Excitation functions for 85Rb(a,2n) 87Y, 85Rb(a,3n) 86Y, 85Rb(a,4n) 85Y and 87Rb(a,4n) 87Y have been measured using stacked foil activation technique followed by off-line g-spectroscopy method. The experimentally measured excitation functions have been compared with the theoretical predictions with and without the inclusion of pre-equilibrium emission of particles, made by Alice-91 code. The high-energy tail of the excitation functions show substantial contribution from pre-equilibrium emission.

 

 

 

 

Indian Journal of Pure & Applied Physics

Vol. 41, November 2003, pp. 833-838

 

Application of FTIR and Mössbauer spectroscopy in analysis of some South Indian archaeological potteries

R Venkatachalapathy*, D Gournis#, C Manoharan*, S Dhanapandian & K Deenadayalan

 

FTIR, XRD and room temperature Mössbauer spectra have been recorded for the recently excavated archaeological potteries from Sriperumbudur, Elichanur (Tamil Nadu) and Thiruvanchikulam (Kerala). When firing the clay based materials like potteries, bricks and tiles etc., the presence of a few per cent of iron undergoes characteristic changes in its physical and chemical states depending upon the maximum firing temperature reached and kiln atmosphere, which can be followed by using FTIR and Mössbauer spectroscopic techniques. From the above techniques, the lower limit of firing temperature, firing atmosphere and type of clay used for the production of archaeological potteries were well established.

 

 

 

Indian J Pure & Applied Physics

Vol. 41, November 2003, pp. 839-843

 

Fourier transform infrared spectrum and
normal coordinate analysis of chloroxylenol

S Gunasekaran & R Rajkumar

 

Chloroxylenol is one of the important antiseptic with the molecular formula C8H9ClO. A normal coordinate analysis has been carried out for chloroxylenol for the first time with a systematic set of symmetry coordinates following Wilson's F-G matrix method based on Cs point group symmetry. The frequency assignments for the bands in the Fourier transform infrared spectrum of chloroxylenol have been presented. A reasonable set of potential constants evaluated for this molecule is found to be in good agreement with literature values for similar compounds. To check whether the chosen set of vibrational frequencies contribute maximum to the normal modes of vibration of the molecule, the potential energy distribution has been evaluated. The potential energy distribution values obtained reflect the correctness of the assignments made.

 

 

 

 

Indian Journal of Pure & Applied Physics

Vol. 41, November 2003, pp. 844-848

 

Vibrational analysis of some pyrazole derivatives

t Chithambarathanu, V Umayorubaghan* & V Krishnakumar

 

The compounds 1,3,5-triphenyl-4,5-dihydro pyrazole, 1,3-diphenyl-5(p-methoxy phenyl)-4,5-dihydro pyrazole and 1,3-diphenyl-5(p-methyl phenyl)-4,5-dihydro pyrazole were prepared. The FTIR and laser Raman spectra of the compounds are recorded and all the normal modes of vibrations are assigned.

 

 

 

Indian Journal of Pure & Applied Physics

Vol. 41, November 2003, pp. 849-854

 

Ultrasonic study of molecular interactions in binary liquid mixtures: acrolien & cinnamaldehyde in methanol, cyclohexane & p-dioxane

V D Bhandakkar*, V A Tabhane & Sharda Ghosh

 

The velocity of ultrasonic waves (10 MHz) for different compositions of mixtures of methanol, cyclohexane and p-dioxane with acrolein and cinnamaldehyde has been measured in the temperature range 10-40 °C. The excess compressibility baE and excess molar volume VE parameters have been discussed in the light of inter-molecular AB interactions and resulting disorder in these mixtures. It is observed that excess parameters baE and VE can be used for classification of all types of molecular interactions in binary liquid mixtures.

 

 

 

Indian Journal of Pure & Applied Physics

Vol. 41, November 2003, pp. 855-857

 

Ultrasonic study of binary mixture of DIBK
(di-isobutylketone)   with polar liquids

S Acharya*, R Paikray & G C Mohanty

 

Ultrasonic velocity (C) and density (r) of binary mixture of di-isobutylketone (DIBK) with bromobenzene, chlorobenzene and toluene have been measured at temperature 303.16 K and frequency 2 MHz. The data of C and r have been used to calculate isentropic compressibility (b), acoustic impedance (Z) and inter-molecular free length (Lf) and also excess of these quantities to study the molecular interactions.

 

 

 

Indian Journal of Pure & Applied Physics

Vol. 41, November 2003, pp. 858-862

 

NMR spin lattice relaxation investigation of
some molecular systems and its correlation with dielectric relaxation

S K Vaish, A K Singh, Anupam Singh & N K Mehrotra

 

Experimental measurements of NMR spin lattice relaxation time (T1) of  butanol-1, isopropyl alcohol, 4-bromophenol, o-cresol, m-cresol and p-cresol have been reported. These experimental values of NMR spin-lattice relaxation time (T1) have been correlated with the calculated values of the NMR spin lattice relaxation time obtained using various equations for calculating dielectric relaxation time (t). The calculated values of dielectric and spin lattice relaxation time obtained by using  Murty equation [Murty C R K, Indian J Phys, 32 (1958) 580] are in better agreement with the experimental values.

 

 

 

Indian Journal of Pure & Applied Physics

Vol. 41, November 2003, pp. 863-868

 

Electrical transport in amorphous Ge14Se86-xTlx system

A M Ahmed, N M Megahid & M M Ibrahiem

 

 

The J-E characteristics, dc conductivity and thermoelectric power (TEP) measurements have been carried out on the bulk amorphous Ge14Se86-xTlx samples as a function of composition (x = 22, 23.5, 25 & 28 mole %) and temperature (240-420 K). In general, the J-E characteristics are linear for lower voltages and become non-linear at higher voltages. DC conductivity is found to increase with increasing the content of thallium and measuring temperature. The measured TEP possessed positive sign confirming that the samples are p-type and holes are the majority carriers.

 

 

 

Indian Journal of Pure & Applied Physics

 Vol. 41, November 2003, pp. 869-875

 

Photoluminescence of CuInTe2 films prepared by
annealing of stacked elemental layers

P Guha, S Roy, A K Pal & S Chaudhuri*

 

CuInTe2 films were synthesized by graphite box annealing of In/Cu/Te stacked elemental layers (SEL). The films were polycrystalline in nature and oriented preferentially in the (112) direction. The films characterized by measuring photoluminescence in the temperature range 80-300 K indicated predominate donor-valence band transitions. The temperature dependence of photoluminescence was explained by theoretical models.

 

 

 

Indian Journal of Pure & Applied Physics

Vol. 41, November 2003, pp. 876-878

 

Solvent effect on linear correlation factor and
dielectric relaxation time of butyl alcohol

N Srinivasan, S Kumar & S Krishnan

 

The relaxation time (t) of butyl alcohol with some non-polar solvents like benzene, carbon tetrachloride and 1,4 dioxane have been calculated from Higasi’s method. The linear correlation factor (g) and the thermodynamic parameter like molar free energy of activation for viscous flow (DFh) and the free energy of activation for dielectric relaxation (DFt) also have been calculated.

 

 

 

Indian Journal of Pure & Applied Physics

Vol. 41, November 2003, pp. 879-883

 

A JAVA program for designing synchronously tuned
extended cavity diode laser in Littrow configuration

Sarika Pugla & Santa Chawla

 

Extended cavity diode lasers (ECDL) in Littrow configuration have been widely used in precision atomic physics experiments world over. Designing the cavity to obtain a mode hop free operation in the desired tuning range requires synchronous tuning of the cavity and is extremely critical. A program in JAVA has been developed, taking into account the critical theoretical requirements of the ECDL. The software is user-friendly and the output provides the cavity design. The software can be used for any wavelength and grating with any number of lines in the Littrow configuration.

 

 

 

Indian Journal of Pure & Applied Physics

Vol. 41, November 2003, pp. 884-893

 

Theoretical approach to lyoluminescence of organic materials

B P Chandra*, Anubha S Gour*, Vivek K Chandra, D S Baghel & P K Khare

 

Considering the mechanism of lyoluminescence (LL) in organic materials, an expression is derived for LL intensity, which indicates that, when the organic material is dissolved into the solution, then, initially, the LL intensity should increase linearly with time, attain a peak value and then it should decrease exponentially with time. Expressions are also derived for the time tm at which, the LL corresponding to the time tm and for the total LL intensity IT. From the decay of LL intensity, the value of the rate constant σ for the decay of alkyl radical concentration is determined and it is found to be 0.49 and 1.72 sec-1 for sachharide and mannose. These values give that,  the decay time of alkyl radical concentration should be 2.04 and 0.87 sec for saccharide and mannose. From the values of tm and σ, the value of the rate constant (e+l) for the decay of peroxy radical concentration is determined and it is found to be 1.0 and 2.3 sec-1 for saccharide and mannose  respectively. These values of rate was constant which indicates that, decay-time of peroxy radical concentration should be 0.62 and 0.43 sec for saccharide and mannose respectively. A good agreement is found between the theoretical and experimental results.

 

 

 

Indian Journal of Pure & Applied Physics

Vol. 41, October 2003, pp. 894-896

 

Decay behaviour of CaS phosphors activated by
Ce3+, Na+ and Cu+

Manoj Tiwari, Vijay Singh, S J Dhoble* & O N Awasthi

 

The nature of phosphorescence decay of calcium sulphide phosphors activated by Ce3+, Na+ and Cu+ has been studied. The variation in the value of trap depth has been studied by UV excitation in phosphorescence decay. These results indicated that, the groups of traps studied have been associated directly with the activator (Ce3+, Na+ and Cu+) in CaS by UV excitation. By peeling off procedure, as suggested by Bube [Phys Rev, 80 (1950) 655], three different trap depths have been  obtained.