Research On Electrostatic Field Orientation And Spectroscopy Of Cold Polar Molecule

The orientation of cold polar molecules is a new technology controlling molecules in the laboratory frame by orientating the molecular electric dipole moments along a fixed direction using a strong electrostatic field. It plays important roles in many areas, such as cold collisions, cold chemical reactions, interactions of molecules with a surface, quantum computing and quantum information.In the present thesis, diatomic radicals are investigated by laser-induced-fluorescence (LIF) in the supersonic molecular beam system. The laser frequency scanning, spectral data acquisition of a Box-car and spectral data storage access are automatically controlled based on the programming synchronously controlling a nanosecond dye-laser and the Box-car by LabVIEW language. Rotational spectrum of (0,0) band in the A2∑+-X2∏system of OH radical was measured and in agreement with the previously reported, which proved the reliability of our developing automatic control system of LIF.Additionally, the basic theory of molecular orientation is studied, including solving the Schrodinger equation containing the interaction of the dipole with the applied external electric field and simulating the orientation depth vs. the electric field and the rotational temperature. These results would be helpful for further theoretical and experimental investigation.