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$CO_{2}$/MWSB GENERATION WITH HIGH-J, SEQUENCE, AND HOT BAND $CO_{2}$ LASER LINES AND BROADBAND SCAN CAPABILITY

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/20879

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Title: $CO_{2}$/MWSB GENERATION WITH HIGH-J, SEQUENCE, AND HOT BAND $CO_{2}$ LASER LINES AND BROADBAND SCAN CAPABILITY
Creators: Sun, Z. D.; Liu, Qiang Kevin; Dorovskikh, Vladimir; Tretyakov, M. Yu.; Lees, R. M.; Xu, Li-Hong
Issue Date: 2003
Abstract: A broadband tunable $CO_{2}$-laser/microwave sideband spectrometer is now in operation at UNBSJ with the following note-worthy features: (i) The source coverage has been significantly improved as we have obtained useful sideband power for regular $CO_{2}$ lines up to very high $J (J_{max} = 56)$ as well as hot and sequence band $CO_{2}$ laser lines, giving continuous coverage over significant spectral regions; (ii) The whole system has now been automated with sophisticated computer-controlled sweep and data capture in which the HP-MW synthesizer and Fabry-Perot etalon filter are scanned simultaneously to give wide-band continuous sweep over the full 7-18 GHz range for either sideband; (iii) Balanced detection of sample and reference has greatly improved the S/N ratio through compensation for background variations. Tests on the dense methanol spectrum in our room temperature multipass static cell around $10 {\mu}m$ have shown excellent resolution and S/N ratio using the hot and sequence band $CO_{2}$ lines. Use of the source in the first tests of our supersonic slit-jet cooled molecular beam with OCS have shown significantly reduced line width compared to room-temperature static-cell values.
URI: http://hdl.handle.net/1811/20879
Other Identifiers: 2003-RD-10
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