Study On The Emission Spectra Of The Glow Discharge Of Cold And Hot Molecules

The technology of supersonic molecular beam is an important research method of molecular spectroscopy,chemical reaction kinetics,material preparation and other involved fields,which combining with other technology has become an important and extensive research tool in the chemical physics.Plasma can provide a new method for synthesis of new material, Gas discharging which is a main way of getting plasma is widely used.The technology of diagnosis of spectroscopic plasma has important basis and applied significance in the related field.This paper discusses supersonic molecular beam, pulsed discharge spectroscopic experimental system and continuous glow discharge spectroscopic experimental system,using air as the example of glow discharging,we obtain spectroscopy of the product of discharging,mainly coming from the transition of the second positive system (C3Πu-B3Πg), the first positive system (B3Πu-A3Σu+) of nitrogen and the first negitive system (B2Σu+-B2Σg+) of nitrogen ion.By the fitting of spectroscopic intensity,we obtain the relative population of upper vibrational state respectively.The result indicate that upper vibrational state of supersonic molecular beam lies in Non-thermal equilibrium,but upper vibrational state of in the discharing tube still lies in thermal equilibrium.We fit the vibrational temperature by the result.At the same time,we obtain the vibrational temperature and rotational temperature by the program of LIFBASE,which coincide with experimental result.This article also introduces the discharged products in the glow discharge of the methanol, mainly coming from CO of excited state transition of B1Σ-A1Π, CH of excited state transition A2△-X2Πand CHO (329.82nm), CH2O (369.8nm), CH3O (347.8nm), H and other emission spectrum, by changing the discharged current and pressure of sample, we measured CO, CH, and H emission spectrum intensity and the corresponding kinetic mechanism. At the same time, we carried out research on the CN radicals which was excited by Penning effect and dissociation mechanism, establishing theoretical model, through the relationship between the spectral intensity and the discharged voltage,the interpretating the mechanism of CN of experimental molecular beam.