| Revista: | Brazilian journal of physics |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000334085 |
| ISSN: | 0103-9733 |
| Autores: | Sismanoglu, B.N1 Cunha, C.L.A1 Gomes, M.P2 Caetano, R2 Caetano, K.G3 |
| Instituciones: | 1Instituto Tecnologico de Aeronautica, Departamento de Fisica, Sao Jose dos Campos, Sao Paulo. Brasil 2Comando-Geral de Tecnologia Aeroespacial, Laboratorio de Optica e Espectroscopia, Sao Jose dos Campos, Sao Paulo. Brasil 3Bulgarian Academy of Sciences, Institute of Electronics, Sofia. Bulgaria |
| Año: | 2010 |
| Periodo: | Dic |
| Volumen: | 40 |
| Número: | 4 |
| Paginación: | 459-463 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Artículo |
| Enfoque: | Experimental |
| Resumen en inglés | Microdischarges at moderate to high pressure in argon were investigated. A hole opening diameter of 500 µm direct current (dc) microhollow cathode discharges (MHCD) were characterized by electrical measurements and optical emission spectroscopy (OES) for pressures ranging between 90 and 800 Torr and current from 5 to 20 mA. Current-voltage characteristic curves were obtained as a function of the pressure for this hole diameter. MHCD enables stable dc discharges for molybdenum electrodes material at constant Ar + 2%H2 flow of 0.03 l/min. Optical emission spectroscopy and analysis of the spectral line broadening of plasma line emissions were performed in order to measure gas discharge parameters. Electron number densities were obtained from Hβ Balmer line ( ~ 1014 cm-3). For the above mentioned discharge conditions, gas temperature was estimated to be 550 - 850 K from OH rotational bands. Excitation temperature was measured based on two lines method (from atomic Mo lines) and from 4p - 4s and 5p - 4s Ar radiative transitions. Hydrogen atom temperature was measured for 800 Torr ( ~ 12000 K) |
| Disciplinas: | Física y astronomía |
| Palabras clave: | Física atómica y molecular, Optica, Teoría cinética y plasmas, Microdescargas, Descargas microcavidad de cátodo, Espectroscopio de emisión óptica |
| Keyword: | Physics and astronomy, Atomic and molecular physics, Kinetic theory and plasma, Optics, Microdischarges, Microhollow cathode discharges, Optical emission spectroscopy |
| Texto completo: | Texto completo (Ver HTML) |
