{"id":8160,"date":"2021-01-25T10:32:02","date_gmt":"2021-01-25T09:32:02","guid":{"rendered":"http:\/\/www.cinam.univ-mrs.fr\/cinam\/?p=8160"},"modified":"2021-01-25T11:24:03","modified_gmt":"2021-01-25T10:24:03","slug":"in-the-universe-cosmic-dust-might-condense-gases-less-than-thought","status":"publish","type":"post","link":"https:\/\/www.cinam.univ-mrs.fr\/cinam\/en\/2021\/01\/25\/in-the-universe-cosmic-dust-might-condense-gases-less-than-thought\/","title":{"rendered":"In the universe, cosmic dust might condense gases less than thought&#8230;"},"content":{"rendered":"<p>Ices are of paramount importance in the physical and chemical evolution of the universe. Their formation results from the cryo-condensation of atomic gases (H, O, C, &#8230;) on the surface of small grains of cold cosmic dust (T&lt; 20 K). Several laboratory measurements have shown that, on flat surfaces with a chemical composition like that of dust grains (carbon, olivine), the condensation probabilities (or <strong>sticking coefficients<\/strong>) are close to 1 for most gases. Is this the case on nanometer-size particles, more representative of cosmic dust? Using X-ray photoelectron spectroscopy (XPS), we show that the sticking coefficients of H<sub>2<\/sub>O and CO<sub>2<\/sub> are indeed close to 1 on flat surfaces but are <strong>far smaller than 1<\/strong> on nanoparticles (carbon, olivine, alumina, etc.), bare or previously ice-covered. These new laboratory data will allow a better understanding of the interactions between dust, ice and gas, in diffuse molecular clouds, protoplanetary disks or planetary atmospheres.<\/p>\n<p>&nbsp;<\/p>\n<p>Reference: \u201c<em>Laboratory-based sticking coefficients for ices on a variety of small-grain analogues\u201d, <\/em>C. Laffon, D. Ferry, O. Grauby, Ph. Parent, <em>Nature Astronomy<\/em> (2021).<\/p>\n<p>Available on line: <a href=\"https:\/\/www.nature.com\/articles\/s41550-020-01288-7\">https:\/\/www.nature.com\/articles\/s41550-020-01288-7<\/a><\/p>\n<p>Contact : <a href=\"mailto:philippe.parent@univ-amu.fr\">philippe.parent@univ-amu.fr<\/a><img decoding=\"async\" loading=\"lazy\" class=\"alignright size-full wp-image-8161\" src=\"http:\/\/www.cinam.univ-mrs.fr\/cinam\/wp-content\/uploads\/2021\/01\/Article-parent-EN.png\" alt=\"\" width=\"1974\" height=\"958\" srcset=\"https:\/\/www.cinam.univ-mrs.fr\/cinam\/wp-content\/uploads\/2021\/01\/Article-parent-EN.png 1974w, https:\/\/www.cinam.univ-mrs.fr\/cinam\/wp-content\/uploads\/2021\/01\/Article-parent-EN-300x146.png 300w, https:\/\/www.cinam.univ-mrs.fr\/cinam\/wp-content\/uploads\/2021\/01\/Article-parent-EN-768x373.png 768w, https:\/\/www.cinam.univ-mrs.fr\/cinam\/wp-content\/uploads\/2021\/01\/Article-parent-EN-1024x497.png 1024w\" sizes=\"(max-width: 706px) 89vw, (max-width: 767px) 82vw, 740px\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>A new publication in NM Department<\/p>\n","protected":false},"author":4,"featured_media":8159,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":[],"categories":[31],"tags":[],"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/www.cinam.univ-mrs.fr\/cinam\/en\/wp-json\/wp\/v2\/posts\/8160"}],"collection":[{"href":"https:\/\/www.cinam.univ-mrs.fr\/cinam\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.cinam.univ-mrs.fr\/cinam\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.cinam.univ-mrs.fr\/cinam\/en\/wp-json\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cinam.univ-mrs.fr\/cinam\/en\/wp-json\/wp\/v2\/comments?post=8160"}],"version-history":[{"count":2,"href":"https:\/\/www.cinam.univ-mrs.fr\/cinam\/en\/wp-json\/wp\/v2\/posts\/8160\/revisions"}],"predecessor-version":[{"id":8164,"href":"https:\/\/www.cinam.univ-mrs.fr\/cinam\/en\/wp-json\/wp\/v2\/posts\/8160\/revisions\/8164"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.cinam.univ-mrs.fr\/cinam\/en\/wp-json\/wp\/v2\/media\/8159"}],"wp:attachment":[{"href":"https:\/\/www.cinam.univ-mrs.fr\/cinam\/en\/wp-json\/wp\/v2\/media?parent=8160"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.cinam.univ-mrs.fr\/cinam\/en\/wp-json\/wp\/v2\/categories?post=8160"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.cinam.univ-mrs.fr\/cinam\/en\/wp-json\/wp\/v2\/tags?post=8160"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}