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EPR of Vanadyl Ion Impurities in Single Crystals of RbHC_2O_4

100%
Singh V., Jain V.
Acta Physica Polonica A
|
2002
|
vol. 102
|
issue 6
795-799
EN
The EPR of VO^{2+} in RbHC_2O_4 single crystals has been studied in X-band at≈290 K. Three sites have been observed. VO^{2+} enters the lattice at substitutional and interstitial sites. Spin-Hamiltonian parameters are evaluated.
2
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Correlation of Nearest Neighbour Distance and Bonding Parameters of Exafs of Some Mn and Co Systems

100%
Singh V., Chetal A.
|
EN
Analysing the EXAFS of several Mn and Co systems, the absorbing atom phase shift α and backscattering amplitude phase shift β are evaluated. It is shown that the parameters α and β vary linearly with the nearest neighbour distance, R, except in the systems CoCl_{2}·6H_{2}O, MnSO_{4}·H_{2}O and MnF_{2}. The nearest neighbour distance, R, in the complicated systems like smaltite and braunite minerals was also determined. The values are close to the crystallographic values.
3
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Third-Order Nonlinear Optical Properties and Reverse Saturable Absorption in 2,3-Butanedione Dihydrazone Using z-Scan Technique

81%
Singh V., Aghamkar P., Lal B.
Acta Physica Polonica A
|
2013
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vol. 123
|
issue 1
39-44
EN
Using chemical route a 2,3-butanedione dihydrazone (BDDH) compound was prepared. The third-order nonlinear optical properties of BDDH were investigated by using single beam z-scan technique with Q-switched, frequency doubled Nd:YAG laser (λ = 532 nm) at 5 ns pulse. Effect of excitation intensity on nonlinear optical properties has been studied and found that experimental and computed values are well in agreement. Also, we found the measured nonlinear optical coefficients are nearly ten times larger than the reported. The excited state absorption cross-section of BDDH was found to be larger than that of the ground state absorption cross-section, indicating the reverse saturable absorption.
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