When the sample contains water, the electric dipole moment of the water molecule interacts with the E field in the resonator and a large amount of microwave energy is absorbed by the sample. Flat cells confine the sample to a 0.3 mm space to solve this issue. The hexagonal stems are available. The sample volume is 275 ?l for all cells.
Wilmad uses "-Q" to designate quartzware using Suprasil in the critical portions of the cell. All other cells are prepared from Clear Fused Quartz (CFQ).
NOTE: Cell product numbers that include the letter "S" indicate that optically polished flat windows are joined to the polished wall ends via a special thermal fusion technique to form an ultra high precision bore flat cell. The two windows are parallel to each other within several visible light wave numbers. These items are recommended for EPR experiments the requires critical coupling.
These Aqueous Cells are unique due to the shape of the fill tubes. With their hexagonal outer surface, these special cells make alignment easier to reproduce. Can be used with a goniometer.