Search results for "exaf"
showing 10 items of 822 documents
High-resolution spectroscopy and analysis of the V2 + V3 combination band of SF6 in a supersonic jet expansion
2013
International audience; Sulphur hexafluoride is a very strong greenhouse gas whose concentration is increasing in the atmosphere. It is detected through infrared absorption spectroscopy in the strong ν3 fundamental region. Due to the existence of low-lying vibrational states of this molecule, however, many hot bands arise at room temperature and those are still not known. We present here a contribution to the elucidation of this hot band structure, by analysing the ν2 + ν3 combination band. We use a supersonic jet expansion high-resolution spectrum at a rotational temperature of ca. 25 K that was recorded thanks to the Jet-AILES setup at the Source Optimisée de Lumière d'Energie Intermédiai…
Phase stability and electronic structure of iridium metal at the megabar range
2019
[EN] The 5d transition metals have attracted specific interest for high-pressure studies due to their extraordinary stability and intriguing electronic properties. In particular, iridium metal has been proposed to exhibit a recently discovered pressure-induced electronic transition, the so-called core-level crossing transition at the lowest pressure among all the 5d transition metals. Here, we report an experimental structural characterization of iridium by x-ray probes sensitive to both long- and short-range order in matter. Synchrotron-based powder x-ray diffraction results highlight a large stability range (up to 1.4 Mbar) of the low-pressure phase. The compressibility behaviour was char…
CCDC 1023704: Experimental Crystal Structure Determination
2014
Related Article: Anssi Peuronen, Heikki Rinta, Manu Lahtinen|2015|CrystEngComm|17|1736|doi:10.1039/C4CE01866D
CCDC 879937: Experimental Crystal Structure Determination
2013
Related Article: A.Peuronen, A.Valkonen, M.Kortelainen, K.Rissanen, M.Lahtinen|2012|Cryst.Growth Des.|12|4157|doi:10.1021/cg300669t
CCDC 879938: Experimental Crystal Structure Determination
2013
Related Article: A.Peuronen, A.Valkonen, M.Kortelainen, K.Rissanen, M.Lahtinen|2012|Cryst.Growth Des.|12|4157|doi:10.1021/cg300669t
CCDC 784160: Experimental Crystal Structure Determination
2011
Related Article: R.Francke, G.Schnakenburg, S.R.Waldvogel|2010|Org.Lett.|12|4288|doi:10.1021/ol101698a
CCDC 1834563: Experimental Crystal Structure Determination
2018
Related Article: Serhii Krykun, Vincent Croué, Magali Allain, Zoia Voitenko, Juan Aragó, Enrique Ortí, Sébastien Goeb, Marc Sallé|2018|J.Mater.Chem.C|6|13190|doi:10.1039/C8TC04730H
CCDC 1913148: Experimental Crystal Structure Determination
2019
Related Article: Hongxin Chai, Zhi-Sheng Pan, Liu-Pan Yang, Shan He, Fangfang Pan, Kari Rissanen, Wei Jiang|2019|Chem.Commun.|55|7768|doi:10.1039/C9CC03341F
CCDC 1988067: Experimental Crystal Structure Determination
2020
Related Article: Maurice Dörr, Johannes L. Röckl, Jonas Rein, Dieter Schollmeyer, Siegfried R. Waldvogel|2020|Chem.-Eur.J.|26|10195|doi:10.1002/chem.202001171
Decorated pottery study: Analysis of pigments by x-ray absorbance spectroscopy measurements
2007
Characterization of pigments on decorated pottery fragments has been fully carried out by nondestructive x-ray absorbance spectroscopy (XAS). The samples were a series of pottery shards excavated from the archeological site of Caltagirone (Sicily, Italy), a well-known ceramic production center. Aesthetical criteria and morphological observations allowed us to attribute the samples to quite different historical periods, starting from the 18th century B.C. up to the 16th century A.D. An extensive time interval led us to suppose that different materials and techniques were used for the production of the ceramic paste and also for the preparation of pigments. XAS measurements were performed at …