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ON THE ROLES OF DIFFERENT FREEDOM DEGREES IN THE WATER COULOMB EXPLOSION INITIATED BY A INTENSE X-RAY PULSEтезисы доклада Тезисы
- Авторы: Yudin S.N., Bibikov A.V., Popova M.M., Kiselev M.D., Gryzlova E.V., Grum-Grzhimailo A.N.
- Сборник: Book of abstracts of 20th International Workshop Complex Systems of Charged Particles and Their Interactions with Electromagnetic Radiation, April 8-12, 2024, Prokhorov General Physics Institute of the Russian Academy of Sciences, Moscow, Russia
- Тезисы
- Год издания: 2024
- Место издания: Москва
- Первая страница: 69
- Последняя страница: 69
- Аннотация: When a molecule irradiated with an intense X-ray pulse like the ones generated by the modernfree-electron lasers or synchrotron sources, the prime process to occur is photoeffect, followed by acomplex evolution involving Auger-decay, fluorescence, vibration and dissociation. Finally themolecule obtains essential charge with further Coulomb explosion. For the processes occurring inhigh-frequency domain typically inner-shell ionization dominates over valence-shell, and as resultexotic hollow states of the molecules such as SCH (single core-hole) and DCH (double core-hole)are created. Note that while ground states of H2O+, H2O2+ were explored in a very detail theinvestigation of these dications with 1s-vacancie(s) are very restricted. The lack of these data arecaused by the problem with convergence for hollow states taking place in some numericalapproaches.This work was stimulated by the recent investigation [1], where the moments of water decayfragments were measured in coincidence with Oxygen ion charge. Additionally measured values arecharge distribution and kinetic energy release (KER). Calculations were performed by solving thesystem of classical dynamical equations with the surface of potential energy obtained by theoriginal code [2].We consider water molecule irradiated by the X-Ray pulse with frequency 1 KeV. After firstinner-shell ionization there is a competition between subsequent Auger-decay and ionization. Infirst case H2O(z=+2) the ion relax to the equilibrium linear geometry; in second case there is nostable configuration and the ion decays (if ionization occurs from 1s shall) or dissociates (ifionization occurs form valence shell). Let us emphasize that opening the molecule is crucial toreproduce some experimental finding especially protons observed in the same hemiplane as oxygenion.
- Добавил в систему: Юдин Сергей Николаевич