Angular and Temperature Dependent $^{77}$Se NMR in the Metallic and Field-Induced Spin Density Wave State in (TMTSF)$_{2}$ClO$_{4}$

We present an exploratory investigation of the NMR pulse-power and magnetic field direction dependence of the $^{77}$Se NMR line shapes and relaxation rates in the metallic and field-induced spin density wave (FISDW) state of the quasi-one-dimensional organic conductor (TMTSF)$_{2}$ClO$_{4}$. By reducing the integrated NMR pulse power (via width and/or pulse height), the limitations of the enhancement factor below the FISDW transition are overcome, and the $^{77}$Se spin-lattice relaxation rate 1/T$_{1}$ can be measured in both the metallic and FISDW states vs. temperature and field direction. Our results on the temperature dependence of 1/T$_{1 }$in the vicinity of the FISDW transition, and also a description of the temperature and field direction dependence of the NMR spectra, will be presented.