Reaction Operators for Radical Pairs. The Exactly Solvable Model

In the present work, the reaction operator for radical pairs of the main equation of spin chemistry has been modified on the basis of an exactly solvable model. The model contains both the reversible and irreversible transitions. For this model, expression for the reaction operator is more complex due to the expanded basis of spin states. The reaction operator of a phenomenological equation is a particular case of a more general approach and only in the limiting case of the completely irreversible recombination process, these operators coincide.

Pressure-Volume Behavior of Some Ionic Solids and Geophysical Minerals (CsBr)

Various forms of the equation of state for studying high-pressure behavior of solids have been developed by numerous investigators using phenomenological approaches. A common feature of the phenomenological equation is that they present the relationship between pressure and volume which can be expressed analytically involving two quantities only, viz Bo, B0’ respectively, the isothermal bulk modulus and its first pressure derivative, both at zero pressure. The present proposal which intend to compare the efficiency of the four equations under close examination reports the V/Vo versus P derived from the new modified forms of Murnaghan equations Birch equation (BE) and Freund-Ingalls (FIE) equation obtained for the best agreement with the available experimental data.