Preparation and Highly Sensitive Detection of Ultracold Molecules

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WEISE, Dennis, 2004. Preparation and Highly Sensitive Detection of Ultracold Molecules

@phdthesis{Weise2004Prepa-8934, title={Preparation and Highly Sensitive Detection of Ultracold Molecules}, year={2004}, author={Weise, Dennis}, address={Konstanz}, school={Universität Konstanz} }

<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#" xmlns:bibo="http://purl.org/ontology/bibo/" xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:dcterms="http://purl.org/dc/terms/" xmlns:xsd="http://www.w3.org/2001/XMLSchema#" > <rdf:Description rdf:about="https://kops.uni-konstanz.de/rdf/resource/123456789/8934"> <dcterms:title>Preparation and Highly Sensitive Detection of Ultracold Molecules</dcterms:title> <dcterms:rights rdf:resource="http://nbn-resolving.org/urn:nbn:de:bsz:352-20140905103416863-3868037-7"/> <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-24T17:52:11Z</dc:date> <dcterms:alternative>Präparation und höchstempfindlicher Nachweis ultrakalter Moleküle</dcterms:alternative> <dcterms:issued>2004</dcterms:issued> <dcterms:available rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2011-03-24T17:52:11Z</dcterms:available> <dc:format>application/pdf</dc:format> <dc:creator>Weise, Dennis</dc:creator> <bibo:uri rdf:resource="http://kops.uni-konstanz.de/handle/123456789/8934"/> <dc:language>eng</dc:language> <dcterms:abstract xml:lang="eng">This thesis establishes concepts and technology for a new experiment to collisionally cool and magnetically trap molecular samples at ultralow temperatures. The approach combines buffer-gas loading with a strong superconducting quadrupole magnet in a specially designed dilution refrigerator, thereby providing the opportunity to work with a great variety of paramagnetic particles. Trap depths of more than 1.6 T are realized with the current magnet. Initial tests of the complete apparatus are performed with atomic chromium, for which diffusion in a 4He buffer-gas at temperatures between 200 mK and 1200 mK is observed in the presence of trapping fields. Oxygen is identified as a first suitable molecular candidate for trapping. In a preliminary experiment, introduction from room-temperature into a 4.2 K experimental cell is accomplished via capillary injection. For ultra-sensitive detection, the NICE-OHMS technique is implemented at cryogenic temperatures for the first time. Using a scanned cavity with a finesse of 90,000 and a length of 86 mm, an integrated detection sensitivity of 8.8E-9/rtHz is achieved, corresponding to a minimum detectable absorption coefficient of 1.02E-8/cm at 10 ms integration time. The work presented here thus provides a basis for precision studies on trapped samples of oxygen and many other molecules as well.</dcterms:abstract> <dc:rights>deposit-license</dc:rights> <dc:contributor>Weise, Dennis</dc:contributor> </rdf:Description> </rdf:RDF>

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