Adiabatic Theory of Electron Detachment from Negative Ions in Two-Color Laser Field

Negative ion detachment in bichromatic laser field is considered within the adiabatic theory. The latter represents a recent modification of the famous Keldysh model for multiphoton ionization which makes it quantitatively reliable. We calculate angular differential detachment rates, partial rates for particular ATD (Above Threshold Detachment) channels and total detachment rates for the Hydrogen ion in a bichromatic field with 1:3 frequency ratio and various phase differences. Reliability of the present, extremely simple approach is testified by comparison with much more elaborate earlier calculations.Comment: 22 pages, 6 Postscript figure

Short-Time Creep of Ice

Results of theoretical and experimental studies on failure of ice during short-time creep are reported in this work. Deformation and failure of ice under applied load are treated as a stochastic process composed of discrete events of the occurrence and development of microdefects in the crystal structure of ice. Models of ice deformation have been developed in which the magnitude and duration of stresses and the dependence on temperature have been taken into account. The functional relation between the microprocess of the accumulation of brittle structural defects and the macroprocess of ice deformation has been confirmed. The possibility of monitoring and predicting the stress strain state of ice masses with the help of acoustic emission records has been demonstrated. It has been established that the fundamental theoretical propositions are applicable to vibrocreep and to failure of ice under cyclic loads. The results of dynamic loading experiments confirm that the processes of ice failure during static and dynamic loading are essentially similar, and that the maximum number of structural defects is the proper criterion of failure of ice. This monograph is intended for specialists dealing with physico-mechanical properties of ice under failure loads. Fifty-four illustrations, four tables, and eighty-five references.SOMMAIRE FRANCAIS A SUIVREPeer reviewed: NoNRC publication: Ye