# A COUPLED LASER ABLATION PULSED FOURIER TRANSFORM MICROWAVE SPECTROMETER - INITIAL TESTS

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 Title: A COUPLED LASER ABLATION PULSED FOURIER TRANSFORM MICROWAVE SPECTROMETER - INITIAL TESTS Creators: Suenram, R. D.; Lovas, F. J.; Matsumura, K. Issue Date: 1989 Publisher: Ohio State University Abstract: A pulsed Nd-YAG ablation source has been coupled to a Fabry-Perot cavity. Fourier transform microwave spectrometer. The pulsed laser is used to vaporize non-volatile'' substances in the throat of a pulsed nozzle source. The vaporized substances are entrained in an inert carrier gas and pulsed into the Fabry-Perot cavity of the Fourier transform spectrometer. Initial experiments have involved the first microwave measurement of the interstellar species $SiC_{2}$. The $1_{01}-0_{00}$ transition of $^{28}SiC_{2}$ was observed at 23600.242(4) MHz and the corresponding transitions of $^{29}Si$ and $^{30}Si$ were also observed. $SiC_{2}$ was vaporized from a silicon carbide target rod. The electric dipole moment has also been measured and found to be 2.393(6) D. In another experiment the $J = 3-2$ and 2-1 transitions of KCl have been observed and measured. In this case, liquid KCl was used to coat the SiC rod. Descriptions of these and subsequent experiments will be given. Description: Author Institution: Molecular Spectroscopy Division, National Institute of Standards and Technology URI: http://hdl.handle.net/1811/17788 Other Identifiers: 1989-ME-10