Ionization and Dissociation of the Chlorine Molecule by the Femtosecond Ti: Sapphire Laser Radiation

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Mostafaei, Anahita | 2013

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Type of Document: M.Sc. Thesis
Language: Farsi
Document No: 45674 (04)
University: Sharif University of Technology
Department: Physics
Advisor(s): Sadighi-Bonabi, Rasoul
Abstract:
Ionization probability of Cl2 molecule is studied by irradiation of 800 nm Ti: Sapphire laser pulses at intensities of 1014 Wcm-2 to 1016 Wcm-2 with the Gaussian package. Molecular orbital symmetry and orientation of the molecule dipole moment with laser field polarization axis are very effective in ionization probability. The results show that the most ionization probability for the intensity of 1014 wcm-2 is at 900 and also 50 at intensity of 1016 wcm-2. Due to the lack of intrinsic dipole moment, variation of dipole moment with the intensity, bond length and time evolution of dipole moment are investigated. It is found that there is a linear dependance of these parameters with ionization probability. At the intensity of 1016 wcm-2, electron rescattering and high harmonic generation are probably happened. Therefore, time variation of dipole moment in three coordinates and the probability of the high harmonic generation are studied. The results show that the time variation of dipole moment in the direction of the laser field is large, while in the other directions is negligible
Keywords:
Ionization ; Ionization Probability ; Titanium Sapphire Laser ; Chlorine Molecule