Ultrasonic velocimetry studies on different salts of chitosan: Effect of ion size.

In the present investigation, the effect of ion size on the thermodynamical properties such as ultrasonic velocity (U), adiabatic compressibility (β), acoustic impedance (Z), adiabatic bulk modulus (K), relaxation strength (r) have been obtained for the different salts of chitosan viz., formate (3.5Å), acetate (4.

Laser induced semiconductor-metal transition in a Quantum Well.

The possibility of Semiconductor-Metal Transition under the influence of intense Laser field in a quasi-two dimensional semiconducting system like Al(x)Ga(1-x)As/GaAs Quantum Well in the finite barrier model has been investigated by showing an abrupt change in diamagnetic susceptibility of donor at critical concentration, which can be controlled by the amplitude of Laser field, using variational principle.