About the Authors

B.K. Ostafiychuk

Faculty of Physics and Technology, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivs`k, Ukraine

I.M. Budzulyak

Faculty of Physics and Technology, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivs`k, Ukraine

B.I. Rachiy

Faculty of Physics and Technology, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivs`k, Ukraine

M.M. Kuzyshyn

Faculty of Physics and Technology, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivs`k, Ukraine

L.O. Shyyko

Faculty of Physics and Technology, Vasyl Stefanyk Precarpathian National University, Ivano-Frankivs`k, Ukraine

Corresponding Author

Email: bogdan_rachiy@ukr.net