Equations previously derived for the volume and internal energy of a simple monatomic liquid, using approxlmate geometric theory, are used to calculate the specific heats Cv, Cp and volume V of liquid argon as a function of pressure and temperature. A Lennard-Jones 12-6 interatomic pair potential is used. The results are compared with the correspondmg experimental curves. The qualitative features of the (P, V ) isotherms are reasonably reproduced, and at high pressures the densities are within 25% of the experimental values. The agreement of the specific heats is poorer, although the correct order of magnitude is predicted by the theory.

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Formulae for the phase o f each off-diagonal element in terms of the amplitudes of the diagonal elements of the 3 x 3 unitary symmetric S matrix, together with the inverse relations, are given. The formulae have been used to check numerical calculations by applying them to three coupled channel potential wells.

The polymer films are widely used as the reflecting materials in any types of the optical systems. It demands the detail studies ofthe basics and threshold parameters of laser ablation destruction such a materials in the power laser radiation with pulse energy density in range from 1 up to 100 i/cm2. The probability of the target laser ablation destruction versus the incident laser radiation energy density dependencies for any polymers the high pressure polyethylene, epoxy compound, polytetraphluoroethylene and rubber for comparing -have been a subject of the experimental studies. It takes into account all of the energy distribution channels -reflectance, scattering and absorbance for laser ablation ofthese samples and . These results show that about I 1 % of absorbed laser pulse energy was transferred to the target as the shock wave spreading in it when the target thickness is greater than the distance which this shock wave spreads in the time oflaser pulse action.

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