Spectroscopic Investigation On Supersonic Ti Atomic Beam And Plasma Diagnosis

In recent years, the high electronic excited state dynamics of the transition metal atoms is an active research area for it has potential applications in the fields of new light-emitting and laser materials. It is essential to prepare high concentration and stable free metal atoms at their electronic ground state in the experimental study of the transition metal of high metal atom dynamics of electronic excited states. In Chapter II, high concentration of free Ti atomic beam was experimentally produced using the laser ablation in supersonic jet. The (1+1) REMPI spectrum of Ti atom were measured and assigned in the wavelength range of 315 to 321 nm. The experimental results show that the experimental technique used is an effective way to produce the free metal atomic beam source with intense and stability, which can be observed with high sensitive and high resolution.Molecular beam is formed by spraying high-pressure gas through a spray hole (nozzle) into an expansion chamber. Most molecules in the beam are populated in their vibrational ground state, which results in easy to be analyzed. Pulsed molecular beam technology is widely employed in the molecular spectroscopic study due to its virtues over the continuum one. Chapter III of this paper introduced the basic principles of supersonic molecular beam experiments and related research and studied the longitudinal and transverse velocity distributions.Plasma as the fourth state of matter is widely found in nature, the gas discharge physics is an important part of plasma physics, in which the temperature, electric field and ionized quantum efficiency are important parameters. The diagnosis of these parameters can be informed of the relevant plasma physics and chemical reaction kinetics. A laser spectroscopy with both high sensitivity and high resolution, optical heterodyne detected velocity modulation spectroscopy (OH-VMS), as a good non-intrusive spectral diagnosing method, will play an important role in the plasma diagnosis. In Chapter IV, CO~+ is taken as an example to study the influence of the OH-VMS spectral intensity on the Penning discharging current and the partial gas pressure of the mixture which comprises minimal parent gas CO/CO2 and vast buffer gas helium. After optimized, some plasma parameters, e.g. the temperature, the electric field intensity in the positive column and ionization quantum efficiency of CO~+ were determined.