Hyperfine polarization and its normal gradient coefficient of [formula presented] atoms in the vicinity ([formula presented]) of coated and uncoated pyrex glass surfaces

We have made regionally specific measurement of the hyperfine polarization [Formula presented] of [Formula presented] atoms in the vicinity ([Formula Presented]) of coated and uncoated Pyrex glass surfaces. We find that the polarization near an uncoated surface decreases rapidly with decreasing distance from the surface whereas for a silicone-coated surface the polarization is independent of the distance from the surface. We have also determined the normal gradient coefficient [Formula presented] of the hyperfine polarization in uncoated cells. In a representative uncoated cell, at a Rb density [Formula presented] and a pump beam intensity [Formula presented], we find [Formula presented].