[Asymmetric control method for ion shutter and the resolution improvement of ion mobility spectrum].

In order to change the driving mode of ion shutter, simplify the design of ion shutter driving power and improve the resolution of ion mobility spectrometry, a series of resistors were added to achieve asymmetric power supply of ion shutter, and the low voltage part was controlled to realize the function of ion shutter. Two conditions in this mode, the effect of electric field in drift tube and the resolution and signal-to-noise ratio of ion mobility spectrum were analyzed. Aided by SIMION 7.

[Characterization of an atmospheric pressure DC microplasma jet].

In the present work, a simply designed and easy made micrometer plasma jet device operating under atmospheric pressure was characterized. The microplasma jet operates in many kinds of working gas at atmospheric pressure, such as Ar, He, N2 etc, and is powered by a direct current power source. It can generate high current density glow discharge.

[Spectroscopic study of atmospheric pressure argon DC microdischarge].

Microhollow cathode discharge or microdischarge is an efficient method to generate plasma in a high pressure gas. In the present work, the emission spectra were observed in an atmospheric pressure argon direct current microdischarge apparatus, using a stainless steel capillary as the cathode, and a stainless steel mesh as the anode. It was shown that all of the seventeen argon spectral lines arose from electronically excited argon atom 4p-4s transition in the wavelength range of 690-860 nm.