Plasma generation in an organic molecular gas by an ultraviolet laser pulse
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چکیده
Plasmas are generated in a low ionization potential gas, tetrakis(dimethylamino)ethylene (TMAE) vapor through a one-photon ionization process by an ultraviolet laser beam at a 193 nm wavelength. The TMAE plasma characteristics are studied by means of a L.angmuir probe and microwave scattering. A new method is used to measure the 193 nm ultraviolet (UV) photon absorption cross section in TMAE. It. is determined to be 1.1 f 0.3 x lo-l7 cm’ from the axial profile of electron density. The temporal evolution of electron temperature is measured. A peak electron density of n,=5 x 10r3/cm3 and peak electron temperature of T,= 1 eV are measured at 500 mTorr TMAE pressure. The plasma decay process is studied, and the electron-ion recombination coefficient is measured to be 5.4*0.5X lo-” cm”/s. A theoretical model is derived to describe the photon flux and the one photon ionization process. An application of a TMAE plasma as a mirror for microwave reflecctions is proposed.
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تاریخ انتشار 1999