1. Department of Physics and the Study Center for Multidisciplinary Applied Research and Technology, Universitas Kristen SatyaWacana, Salatiga, Indonesia
2. Department of Chemistry and the Study Center for Multidisciplinary Applied Research and Technology, Universitas Kristen SatyaWacana, Salatiga, Indonesia
3. Department of Physics, Universitas Gadjah Mada, Yogyakarta, Indonesia