Abstract
A coaxial-type Stark cell was designed as a conveniently small-sized apparatus for operation at all microwave frequencies between 3400 and 900 Mc (and lower) without changing either the sample under investigation or the size of the absorption cell. The Stark voltage is applied between the inner and outer conductors of the coaxial line and is separated from the rf signal at each end of the cell by sections of wave guide. The use of this cell has permitted the extension of microwave absorption measurements in gases to a new and extremely low range of frequencies. It was used to discover and investigate the full series of ND3 absorption lines in this new range.
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