# THE ZURICH HIGH RESOLUTION COLLISIONAL-COOLING CELL-FTIR SETUP: ROVIBRATIONAL SPECTROSCOPY OF METHANOID MOLECULES BETWEEN 60 AND 300 K

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 Title: THE ZURICH HIGH RESOLUTION COLLISIONAL-COOLING CELL-FTIR SETUP: ROVIBRATIONAL SPECTROSCOPY OF METHANOID MOLECULES BETWEEN 60 AND 300 K Creators: Albert, S.; Albert, Karen Keppler; Bauerecker, S.; Quack, Martin Issue Date: 2007 Abstract: A complete understanding of the absorption behavior of the Earth's atmosphere and of the atmospheres of the giant planets (Saturn and Jupiter) and their moons (Titan) requires a detailed spectroscopic investigation of methanoid molecules over full atmospheric temperature ranges. For that reason we have interfaced a collisional and enclosive cooling cell} in press.} based on White-type multireflection optics to our FTIR IFS125 HR prototype 2001 spectrometer}, {\it Trends in Optics and Photonics} {\bf 84}, 177 (2003).} (MOPD=10 m). This cell makes it possible to record spectra at high spectral resolution in the temperature range 4-400 K with absorption path lengths up to 20 m. We have recorded the spectra of CH$_4$} and its isotopomers} and of CHF$_3$}, CHClF$_2$} {\bf 102}, 1671 (2004).} and CHCl$_2$F$^a$ between 2000 and 6000 cm$^{-1}$ in the temperature range 60-300 K. The spectra were recorded at resolutions ranging from 0.0015 to 0.004 cm$^{-1}$. We will present an analysis of the spectra of CHCl$_2$F in the $2\nu_3$ and $3\nu_3$ regions and an initial assignment of the resonance system $2\nu_3/\nu_3 +\nu_8/2\nu_8$ of CHClF$_2$. We discuss coincidences with CO$_2$ laser lines in the $2\nu_3$ region of the isotopic chiral molecule CH$^{35}$Cl$^{37}$ClF. Doppler-free quasi-resonantly enhanced ultra-high two-photon absorption experiments may be carried out in this region to study parity violation} {\bf 114}, 4812 (2002), M. Quack and J. Stohner, {\it J. Chem. Phys.} {\bf 119}, 11228 (2003), R. Berger, G. Laubender, M. Quack, A. Sieben, J. Stohner and M. Willeke, {\it Angew. Chem. Int. Ed. Eng.} {\bf 44}, 3623 (2005).} in this molecule. In addition, we show CO nanoparticles recorded at 6 K } {\bf 72}, 3946 (2001).}. URI: http://hdl.handle.net/1811/31585 Other Identifiers: 2007-TG-06