A. Nur Department of Physics, Faculty of Sciences and Mathematics, Mulawarman University, Samarinda 75123 Indonesia
Department of Physics
K. Nurhanafi Department of Physics, Faculty of Sciences and Mathematics, Mulawarman University, Samarinda 75123 Indonesia
E. R. Putri Department of Physics, Faculty of Sciences and Mathematics, Mulawarman University, Samarinda 75123 Indonesia