Investigation of microwave transitions and nonlinear magneto-optical   rotation in anti-relaxation-coated cells
  Using laser optical pumping, widths and frequency shifts are determined for microwave transitions between ground-state hyperfine components of $^{85}$Rb and $^{87}$Rb atoms contained in vapor cells with alkane anti-relaxation coatings. The results are compared with data on Zeeman relaxation obtained in nonlinear magneto-optical rotation (NMOR) experiments, a comparison important for quantitative understanding of spin-relaxation mechanisms in coated cells. By comparing cells manufactured over a forty-year period we demonstrate the long-term stability of coated cells, an important property for atomic clocks and magnetometers. 
D. Budker, L. Hollberg, D. F. Kimball, J. Kitching, S. Pustelny, and   V. V. Yashchuk