for the relative percent of spins at equilibrium magnetization. Following this procedure yields SiSi3H and SiSi3X populations of ca. 70 and 30 %, respectively. Analytical simulation of the 60 min recycle delay Si spin echo spectrum reveals an ca. 2:1 ratio of SiSi3Cl to SiSi3OH, respectively (Figure ). Therefore, the SiSi3H, SiSi3Cl and SiSi3OH populations are estimated to be ca. 70, 20 and 10 %, respectively.