j'ar inir.wd 1mx magncric resonance spectra of the NS radical in its S 'ny2 slate have been dctcctcd at 680 pm (J = 8.5 -9.S)~ncl~I~~nl(J=11.5- 12.5). The spectra show partly rcsolwd structure due to l~ypcrlinc splitting and A doubling. Tl:ls is 11w fir*1 rcporrcd mrasurcmcnt of A doubling in the 2r13,2 smtc of the radical. The NS radical has been widely studied by microwave spectroscopy following tile detection of its Xband EI'R spcctrunl by Cmington and co-workers [I, 21. Their analysis of rhe J = 313 magnetic resonance spcctruni, bsscd on a value of& from optical spectroscopy, yielded rfle first determinations of magnetic llyperfine and electric qundrupole parameters [3] _ Lam work by Uchara and hlorino f3j on the same J = 3/Z spectrum (using a newly available microwave value of /I,, ) yielded essentially identical results. Microwave spectra of the lowest rotational levels of botfl ', n tjz arxf 2 Iljtl states fed to further improvements in accuracy of both rotational and hyperfine parameters, and IO the determination of the I\ doubling parameter,p,,y, from 2 II ,,, rotational spectra [4]. Microwave measurements ltavi been cstended recently toJ = 6.5 [S]. However. even for tflis high rotational level the sniall A doubling in the 2 If 3,2 state camlot be resolved by micro-WIVC techniques. Tftc fundamental band of NS around 8.3 1.1111 1x1s been iI~~fe$ti~ated by diode laser spcctrocopy ICI, ;fc Doppler-limited resolution, and yields highly accurate equilibrium parameters for the radical.