Synchrotron radiation and long path cryogenic cells: New tools and results for modelling chlorinated compounds absorption in the 8-12&#181;m atmospheric window
Authors: Manceron Laurent 
Published: March 2020

&lt;p&gt;&amp;#160;&lt;/p&gt;&lt;p&gt;&lt;strong&gt;Anusanth Anantharajah&lt;sup&gt;a&lt;/sup&gt;, Fridolin Kwabia Tchana&lt;sup&gt;a&lt;/sup&gt;, Jean-Marie Flaud&lt;sup&gt;a&lt;/sup&gt; , Pascale Roy&lt;sup&gt;b&lt;/sup&gt; and Laurent Manceron&lt;sup&gt;b,c&lt;/sup&gt;&lt;/strong&gt;&lt;/p&gt;&lt;ul&gt;&lt;li&gt;a- Laboratoire Interuniversitaire des Syst&amp;#232;mes Atmosph&amp;#233;riques (LISA), UMR CNRS 7583, &lt;br&gt;Universit&amp;#233; de Paris et Universit&amp;#233; Paris-Est Cr&amp;#233;teil, Institut Pierre Simon Laplace, &lt;br&gt;61 Avenue du G&amp;#233;n&amp;#233;ral de Gaulle, 94010 Cr&amp;#233;teil Cedex, France.&lt;/li&gt;
&lt;li&gt;b- Synchrotron SOLEIL, AILES Beamline, L&amp;#8217;Orme des Merisiers, Saint-Aubin F-91192, France.&lt;/li&gt;
&lt;li&gt;c-&amp;#160; Sorbonne Universit&amp;#233;, CNRS, MONARIS, UMR 8233, 4 place Jussieu, F-75005 Paris, France.&amp;#160;&lt;/li&gt;
&lt;/ul&gt;&lt;p&gt;&amp;#160;&lt;/p&gt;&lt;p&gt;Nitryl chloride (ClNO&lt;sub&gt;2&lt;/sub&gt;) and Chlorine Nitrate are molecules of great interest for atmospheric chemistry since these are produced by heterogeneous reactions, in the marine troposphere, between NaCl sea-salt aerosols or ClO and gaseous N&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt; [1,2], and on polar stratospheric clouds, between N&lt;sub&gt;2&lt;/sub&gt;O&lt;sub&gt;5&lt;/sub&gt; and solid HCl [3,4].&lt;/p&gt;&lt;p&gt;&amp;#160;&lt;/p&gt;&lt;p&gt;Many high-resolution spectroscopic studies in the microwave and mid-infrared regions are available. However, these molecules present low-lying vibrational levels and thus numerous hot bands in the regions of the NOx stretching and bending mode absorptions in the 8-12 &amp;#181;m atmospheric transparency window which could serve for remote sensing and quantification of these species.&lt;/p&gt;&lt;p&gt;Fourier Transform Spectrometry is a useful technique to observe broad band high resolution spectra (0.001 cm&lt;sup&gt;-1&lt;/sup&gt;) of these molecules and a significant advantage is gained by combining interferometry with the high brightness of a synchrotron source [5]. At SOLEIL we have developed specific instrumentation to study such reactive molecules and a few results concerning chlorine-containing compounds will be presented.&lt;/p&gt;&lt;ol&gt;&lt;li&gt;B. J. Finlayson-Pitts, M. J. Ezell, and J. N. Pitts Jr, Nature &lt;strong&gt;337&lt;/strong&gt;, 241-244 (1989).&lt;/li&gt;
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