34-th EGAS Conference 9-12 July 2002, Sofia, Bulgaria P2-16 SUBNATURAL WIDTH RESONANCES AT MULTI-FREQUENCY EXCITATION OF SINGLE HYPERFINE TRANSITION IN Cs 1 Ch.Andreeva, 2 V.Biancalana, 1 S.Cartaleva, 1,2 Y.Dancheva, 2 C.Marinelli, 2 E.Mariotti, 2 L.Moi 1 Institute of Electronics-BAS, Tsarigradsko Shosse 72, 1784 Sofia, BULGARIA e- mail: dilas@ie.bas.bg 2 INFM UdR di Siena and Dip. di Fisica, Univ. di Siena, V. Banchi di Sotto 55, 53100 Siena, ITALY