# A COAXIALLY ORIENTED BEAM-RESONATOR ARRANGEMENT FOURIER TRANSFORM MICROWAVE (COBRA-FTMW) SPECTROMETER; GOING CRYOGENIC

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 Title: A COAXIALLY ORIENTED BEAM-RESONATOR ARRANGEMENT FOURIER TRANSFORM MICROWAVE (COBRA-FTMW) SPECTROMETER; GOING CRYOGENIC Creators: Grabow, Jens-Uwe; Palmer, Samuel; Thaddeus, Patrick Issue Date: 1997 Abstract: After the initial experiments of microwave spectroscopy in the time $domain^{g}$ it took more than two decades before the technique was re-born. First as a steady gas-$waveguide^{h}$, later as a molecular beam-$resonator^{i}$ application, the experiment became an established spectroscopic oriented beam-resonator arrangement (COBRA)$^{jk}$ has dramatically improved the resolution and the sensitivity of the Fourier transform microwave (FTMW) spectrometer. Our current efforts are aiming at an improvement of the COBRA-FTMW sensitivity by means of reduction of the thermal noise background, i.e. reducing the 300K thermal noise power of $P_{N} =kTRB$ at room temperature to the equivalent of 77K -the temperature of liquid nitrogen. We will present a detailed theoretical background which is needed to approach the expected gain in S/N for a spectrometer operated at temperatures significantly below the thermal environment. URI: http://hdl.handle.net/1811/13881 Other Identifiers: 1997-MI-03