(1) A. N. Sevchenko Scientific Research Institute of Applied Physical Problems, 7 Kurchatov Str., 220064 Minsk, Berlarus;(2) International Laser Center at the Belorussian State University, Minsk
Abstract:
Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 62, No. 6, pp. 123–129, November–December, 1995.