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A BROADLY TUNABLE, AUTOMATED MICROWAVE SPECTROMETER FOR THE OBSERVATION OF WEAKLY-BOUND COMPLEXES.

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/17789

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Title: A BROADLY TUNABLE, AUTOMATED MICROWAVE SPECTROMETER FOR THE OBSERVATION OF WEAKLY-BOUND COMPLEXES.
Creators: Bumgarner, R. E.; Blake, Geoffrey A.
Issue Date: 1989
Abstract: A microwave spectrometer operating from 20.0-60.0 GHz has been constructed for the observation of rotational spectra of weakly bound complexes. The complexes are created in an expansion through a 0.001 ``by 0.06-1.75'' slit nozzle. The microwaves are frequency modulated at 50 kHz and free space propagated across the molecular beam after which they fall on a standard diode detector. Subsequent lock-in detection at twice the modulation frequency is performed to increase the signal-to-noise. A phase-locked, GPIB controllable frequency synthesizer capable of operating at 10.0 MHz-20.0 GHz is used in combination with a doubler or tripler to generate the radiation. The lock-in amplifier is also GPIB controlled so that the entire experiment is computer interfaced. The broadbandedness of the quasi-optical propagation scheme allows for sweeps of up to 20 GHz to be performed without operator intervention. Sweep rates of 200 MHz/hour are achievable with good signal-to-noise for weakly bound complexes. The higher frequency range of this spectrometer relative to currently operating Flygare-Balle type instruments should allow for a number of b-type transitions of near prolate complexes to be observed. Applications of this instrument to new measurements on Ar-HCl, Ar-HCN, $(HCN)_{2}$ and other molecules will be presented.
URI: http://hdl.handle.net/1811/17789
Other Identifiers: 1989-ME-11
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