[1] Univ Sonora, Centro Invest Fis, Hermosillo 86190, Sonora, Mexico
[2] Inst Nacl Pesquisas Espaciais, Lab Assoc Plasma, BR-12201970 Sao Jose Dos Campos, Brazil
[3] Natl Autonomous Univ Mexico, Inst Ciencias Nucl, Mexico City 04510, DF, Mexico
[4] Univ Sonora, Dept Invest Polimeros & Mat, Hermosillo 86190, Sonora, Mexico