Nuclear Dynamics Of Hydrogen Molecular Ion In Coulomb Explosion

Coulomb explosion is an importance resulting from theinteraction of strong femtosecond laser fields with the molecules. Ithas attracted more and more attention for both theorists andexperimentalists. As a tool to study ionization and dissociationdynamics of molecules in Coulomb explosion, the Coulombexplosion nuclear kinetic-energy-release spectrum of moleculeshas very significant application prospect. Aiming at the above hotissue, in this article, not only the Coulomb explosion nuclearkinetic-energy-release spectrum of hydrogen molecular ion istheoretically simulated, but also the isotopic effect on nucleardynamics in Coulomb explosion is investigated. In addition,ionization channels of hydrogen molecular ion for various initialvibrational states in intense laser field and the intermediate state ofcharge-resonance-enhanced ionization are discussed by simulatingthe nuclear initial kinetic-energy-release spectra.The main contents of our works are:(1) theoretical investigationof nuclear dynamics for hydrogen molecular ion in Coulombexplosion. The Coulomb explosion nuclear kinetic-energy-release spectrum of hydrogen molecular ion in various initial vibrationalstates is theoretically simulated by numerically solving theone-dimensional time-dependent Schr dinger equation in nonBorn-Oppenheimer approximation. The numerical results interpretthat the nuclear dynamics of hydrogen molecular ion in Coulombexplosion largely depends on the selection of the initial vibrationalstates and the dependency is opposite when the high and low initialvibrational states are selected, respectively.(2) the isotopic effecton nuclear dynamics in Coulomb explosion. The isotopic effect onnuclear dynamics in Coulomb explosion for various initialvibrational states of hydrogen molecular ion is investigated bysimulating the Coulomb explosion nuclear kinetic-energy-releasespectra of hydrogen molecular ion and hydrogen deuterium ion forcorresponding vibrational states in intense laser. The calculatedresults confirm that the effect largely depends on the selection ofthe initial vibrational states. Furthermore, it is the special isotopeeffect case about the vibrational state=5. The time-dependentspectrum, which can reveal the difference in nuclear wavepacketmotion between hydrogen molecular ion and hydrogen deuteriumion, is also discussed.(3) ionization channels of the hydrogenmolecular ion in intense field. Ionization channels of the hydrogenmolecular ion for various vibrational states in intense laser field aretheoretically investigated by simulating the nuclear initialkinetic-energy-release spectra. The results confirm that thechannels largely depend on the selection of initial vibrational statesand the selection of the ionization channels is sensitive to thewavelength of the laser pulse.