ABSTRACT
The possibility of excitation of so-called Mbssbauer low-lying nuclear levels in dense short-lived laser-produced plasma (LPP) was discussed in [ 1 ] . In a very strong laser field charged particles oscillate at the laser frequency. The energy of oscillation can be high enough to be responsible for the effective production of very hot electrons [2] and for the excitation of Mbssbauer nuclei. The emission of y-quanta at precisely given frequencies during the typical lifetime of an excited nucleus can be used as a new tool of LPP diagnostics. The main attention in [ 1 ] was paid to multicharged ions contained in LPP, for which according to [3] the appearance of electronic satellites accompanying nuclear transitions can be expected. The cross section for excitation of the nucleus by an electron impact was calculated in the Born approximation under the assumption that the influence on nuclear excitation of the remaining bound electrons of the ion is negligible or that the nucleus is completely stripped [ 1 ] . It was assumed also that deexcitation of the nuclear is caused only by radiative decay. In some cases these assumptions may be violated. The excited state of the nucleus may decay due to an autoionization process caused by nuclear interaction with ion electron shells . The reverse process of free electron capture accompanied by nuclear excitation may be more effective than direct excitation by electron impact.
