{"id":11372,"date":"2025-09-25T18:54:47","date_gmt":"2025-09-25T16:54:47","guid":{"rendered":"https:\/\/www.institut-foton.eu\/?p=11372"},"modified":"2025-09-26T10:18:37","modified_gmt":"2025-09-26T08:18:37","slug":"these-daria-gutz-29-10-2025","status":"publish","type":"post","link":"https:\/\/www.institut-foton.eu\/en\/these-daria-gutz-29-10-2025\/","title":{"rendered":"Th\u00e8se &#8211; Daria Gudz &#8211; 29\/10\/2025"},"content":{"rendered":"\n<p><strong>L\u2019Institut Foton vous convie \u00e0 la pr\u00e9sentation des travaux de th\u00e8se de doctorat :<\/strong><\/p>\n\n\n\n<p class=\"has-text-align-center has-medium-font-size\"><strong>Submillimeter spectroscopy instrument for detection of volatile soil emissions<\/strong><br><\/p>\n\n\n\n<p class=\"has-text-align-center has-vivid-cyan-blue-color has-text-color has-link-color wp-elements-298f336ac50d9c3537bbbbf399efc40a\">Daria GUDZ<\/p>\n\n\n\n<p>sous la direction de Fran\u00e7ois Bondu et Fran\u00e7oise Binet.<\/p>\n\n\n\n<p><strong>Cette soutenance publique aura lieu le mercredi &nbsp;29 octobre 2025&nbsp;\u00e0 9h30 \u00e0 l&#8217;amphith\u00e9\u00e2tre du PNRB (Campus de Beaulieu, \u00e0 Rennes)<\/strong><\/p>\n\n\n\n<p>Assister \u00e0 la soutenance par Zoom :<\/p>\n\n\n\n<p><a href=\"https:\/\/univ-rennes1-fr.zoom.us\/j\/62611687200\">https:\/\/univ-rennes1-fr.zoom.us\/<a href=\"https:\/\/univ-rennes1-fr.zoom.us\/j\/62611687200\" target=\"_blank\" rel=\"noreferrer noopener\">j\/62611687200<\/a><\/a><\/p>\n\n\n\n<p>ID de r\u00e9union: 626 1168 7200<br>Code secret: 768375<\/p>\n\n\n\n<p>The thesis focuses on soil volatile organic compound (VOC) emissions, which are increasingly recognized as sensitive indicators of human impact and climate change. While current detection methods remain limited by low compound identification rates, this work proposes a novel approach: enhancing metabolite databases with structural information derived from rotational spectroscopy. To support this, a dedicated submillimeter spectrometer was designed and assembled. The system is based on a DC\u2013800 GHz optical frequency synthesizer, which was improved and characterized, achieving a frequency precision of 2\u00b710-6 and a synthesized linewidth of 40 kHz, enabling spectroscopy experiments at low pressures (below 1 mbar). The frequency synthesizer was calibrated below 42 GHz, allowing extrapolation to higher frequencies. A submillimeter spectroscopy bench was also designed and assembled, including a cavity adapted for low-pressure (mbar) measurements. Homodyne detection was optimized, eliminating baseline modulation. The first spectroscopic measurements in our laboratory in this frequency range were performed on acetonitrile. We modeled how instrument noise impacts the signal-to-noise ratio of measurements and determined the detection threshold for this molecule. Future applications include identifying complex VOCs such as methyl salicylate and linking microbial metabolic activity to environmental signals.<br>The work was conducted within an interdisciplinary collaboration between the Ecobio and the Foton Institute research units, bridging physics and ecology to provide new insights into soil health and environmental monitoring.<\/p>\n\n\n\n<div data-wp-interactive=\"core\/file\" class=\"wp-block-file\"><object data-wp-bind--hidden=\"!state.hasPdfPreview\" hidden class=\"wp-block-file__embed\" data=\"https:\/\/www.institut-foton.eu\/wp-content\/uploads\/2025\/09\/Page-de-garde.pdf\" type=\"application\/pdf\" style=\"width:100%;height:600px\" aria-label=\"Embed of Page de garde.\"><\/object><a id=\"wp-block-file--media-74072224-0239-4d6b-809d-b1d0e7c2aeff\" href=\"https:\/\/www.institut-foton.eu\/wp-content\/uploads\/2025\/09\/Page-de-garde.pdf\">Page de garde<\/a><a href=\"https:\/\/www.institut-foton.eu\/wp-content\/uploads\/2025\/09\/Page-de-garde.pdf\" class=\"wp-block-file__button wp-element-button\" download aria-describedby=\"wp-block-file--media-74072224-0239-4d6b-809d-b1d0e7c2aeff\">T\u00e9l\u00e9charger<\/a><\/div>\n","protected":false},"excerpt":{"rendered":"<p>L\u2019Institut Foton vous convie \u00e0 la pr\u00e9sentation des travaux de th\u00e8se de doctorat : Submillimeter spectroscopy instrument for detection of volatile soil emissions Daria GUDZ sous la direction de Fran\u00e7ois Bondu et Fran\u00e7oise Binet. Cette soutenance publique aura lieu le<\/p>\n","protected":false},"author":6,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[37],"tags":[],"class_list":["post-11372","post","type-post","status-publish","format-standard","hentry","category-agenda"],"translation":{"provider":"WPGlobus","version":"3.0.2","language":"en","enabled_languages":["fr","en"],"languages":{"fr":{"title":true,"content":true,"excerpt":false},"en":{"title":false,"content":false,"excerpt":false}}},"_links":{"self":[{"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/posts\/11372","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/users\/6"}],"replies":[{"embeddable":true,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/comments?post=11372"}],"version-history":[{"count":2,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/posts\/11372\/revisions"}],"predecessor-version":[{"id":11375,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/posts\/11372\/revisions\/11375"}],"wp:attachment":[{"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/media?parent=11372"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/categories?post=11372"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.institut-foton.eu\/en\/wp-json\/wp\/v2\/tags?post=11372"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}