SUBMILLIMETER WAVE BEAM MASER SPECTROSCOPY
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Date
1974
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Publisher
Ohio State University
Abstract
A molecular beam maser has been developed to investigate hyperfine structure in the submillimeter wave region. Stimulating power is harmonically generated from a 50 GHz klystron. An InSb photodetector operating at 1.6$^{\circ} K$ is used to detect the output of a tunable Fabry-Perot cavity. Line-widths (FWHM) of 17 KHz are attainable. Line narrowing effects attributable to state selector focusing have been observed. Beam absorption with no state selection and beam emission with state selection have been observed successfully yielding quantitative data on the degree and effects of state selection. The deuterium quadrupole hyperfine structure has been measured for $ND_{3}$ In the $J = 0 \rightarrow 1$ transition at 309 GHz and for $D_{2}O$ in the $1_{1,0}\rightarrow 1_{0,1}$ transition at 316 GHz, The difference between the upper state and lower state deuterium quadrupole coupling constants in $D_{2}O$ has been calculated to be 68 KHz.
Description
This work is supported by the National Science Foundation, Grant No. GP-34590.
Author Institution: Department of Physics, Duke University
Author Institution: Department of Physics, Duke University