M. N. Indro Department of Physics, Institute of Agriculture Bogor Kampus IPB Darmaga, Bogor Indonesia
A. Kartono Department of Physics, Institute of Agriculture Bogor Kampus IPB Darmaga, Bogor Indonesia
M. Kurniati Department of Physics, Institute of Agriculture Bogor Kampus IPB Darmaga, Bogor Indonesia
B. Safitri Department of Physics, Institute of Agriculture Bogor Kampus IPB Darmaga, Bogor Indonesia