# DIAGNOSTIC TESTS OF A COLLISIONAL COOLING CELL USLD IN AN FTIR SPECTROMETER

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/13809

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 Title: DIAGNOSTIC TESTS OF A COLLISIONAL COOLING CELL USLD IN AN FTIR SPECTROMETER Creators: Ball, C. D.; De Lucia, Frank C.; Mengel, M.; Lock, Michael; Winnewisser, B. P.; Winnewisser, M. Issue Date: 1997 Publisher: Ohio State University Abstract: A new, liquid helium cooled collisional cooling cell has been construeted for use in spectral simplification experiments. The cell was cooled in a Janis vaporization cryostat and spectra were measured using a Bruker high resolution Fourier transform infrared spectrometer. Diagnostic tests of this cell using $C_{2}H_{2}, N_{2}O$, and $CCIF_{3}$ injected into a helium buffer gas show that the cell can be a useful tool for future simplification experiments. The initial failures and later successes of these tests revealed important information on the required operational parameters. Near-infrared measurements of $C_{2}H_{2}$ seemed to show only moderate cooling of the gas. However, in the overtone region, the S/N ratio was not adequate for useful diagnostics, and the spectrum was only observed for excessive injector flow rates. In the mid-infrared region, measurements of $N_{2}O$ yielded very acceptable rotational temperatures $(T_{rot} = 76 K$ for $T_{cell} =50 K)$. Measurements of $CCIF_{3}$ lines were taken to demonstrate the capabilities of collisional cooling with this system for spectral simplification. Description: Author Institution: Department of Physics, The Ohio State University; Physikalisch-Chemistches Institut, Justus-Liebig-Universit\""at URI: http://hdl.handle.net/1811/13809 Other Identifiers: 1997-FC-12