1. X-ray absorption spectroscopy and related techniquesAlojz Kodre, Iztok Arčon, Jana Padežnik Gomilšek, 2004, original scientific article Abstract: In the extensive field of X-ray diagnostic techniques, nowadays mostly implemented on synchrotron X-ray sources, the X-ray absorption methods offer a relatively simple tool for structural analysis of materials. The advantage of the methods is the sensitivity to chemical species and the insensitivity to the long-range order. An overview of various detection techniques is given together with the discussion of accuracy of the method with regard to the spatial resolution and the possible contamination by intra-atomic contributions, the multielectron photoexcitations.
Keywords: X-rays, absorption, EXAFS, XANES
Published in DKUM: 30.08.2017; Views: 991; Downloads: 102
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2. Specific EXAFS tools in analysis of MoSI nanowiresAlojz Kodre, Jana Padežnik Gomilšek, Iztok Arčon, Anton Meden, Dragan Mihailović, 2006, original scientific article Abstract: The structure of nanowires prepared by vapor synthesis from Mo, S and I is investigated by methods of x-ray diffraction (XRD) and extended x-ray absorption fine structure (EXAFS). Starting with a qualitative model of the structure from XRD, the metrics is introduced with interatomic distances determined from EXAFS. Two specific tools to increase the resolution of EXAFS method are discussed: the reciprocity relation between data from adjacent target atoms, and difference EXAFS from data on samples with small changes in stoichiometry.
Keywords: EXAFS, nanowires, molybdenum sulphide-iodide
Published in DKUM: 25.08.2017; Views: 881; Downloads: 148
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3. High-resolution X-ray absorption spectrometry of atomic vaporsAndrej Mihelič, Alojz Kodre, Iztok Arčon, Jana Padežnik Gomilšek, 2004, original scientific article Abstract: A measurement of an x-ray absorption spectrum of a monatomic sample yields pure atomic absorption essential for the EXAFS (Extended X-ray Absorption Fine Structure) analysis in cases of a weak structural signal. A construction of an absorption cell to contain vapor sample takes into account specific properties of the investigated element. Metal-vapor absorption cells for the elements K, Zn, Rb, Cd, Cs, and Hg are presented and comments are made on the use of materials and the operating mechanisms of the cells.
Keywords: x-ray absorption, atomic vapors, K, Zn, Rb, Cd, Cs, EXAFS
Published in DKUM: 18.08.2017; Views: 1233; Downloads: 124
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4. EXAFS and IR analysis of electrochromic $NiO_x$/$NiO_xH_y$ thin filmsJana Padežnik Gomilšek, Romana Cerc Korošec, Peter Bukovec, Alojz Kodre, 2008, original scientific article Abstract: Electrochromic (EC) thin films of $NiO_x$ and $NiO_xH_y$ are prepared by sol-gel method from nickel chloride precursor and deposited onto a suitable substrate by dip-coating technique. The development of the structure with thermal treatment is investigated by EXAFS and IR spectroscopy in two series of films, with high and low concentration of chloride as counter ions. In the former, the predominant structure before thermal treatment is nickel hydroxide. The baking induces condensation, yet with no trace of NiO. In the latter group, colloidal particles are indicated, on which acetate groups are adsorbed or coordinated. At the maximum EC-response the formation of NiO grains is established by EXAFS and IR.
Keywords: electrochromism, thin films, nickel oxide, nickel hydroxide, EXAFS
Published in DKUM: 18.08.2017; Views: 1423; Downloads: 108
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5. Pa še tole ---Eoin Colfer, 2015 Abstract: Dogajanje se začne v klubu Beta, ko Arthurjevo druščino tik pred uničenjem Zemlje reši Zaphod Beeblebrox z ladjo Zlato srce, ki jo namesto računalnika Edija zdaj upravlja leva polovica možganov njegove druge glave. Ford Prefect po nerodnosti zamrzne omenjeno polovico in zdi se, da so pogubljeni. A pojavi se nesmrtni Ovečeni Velepotež in jih reši, nakar s svojimi žalitvami tako razjezi Zaphoda, da mu ta obljubi smrt in Velepotež, naveličan življenja, se z veseljem strinja. Le kdo bi ga bil zmožen ubiti - pomislijo na Thora. Pri vsem tem pa jim prav nič ne pomaga okoliščina, da Vogoni hočejo uničiti vse Zemljane.
Keywords: elektronske knjige
Published in DKUM: 30.12.2015; Views: 1336; Downloads: 50
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6. Pretežno neškodljivaDouglas Adams, 2015 Abstract: Prav lahko je ostati brez poguma, če tvoj domači planet uničijo ob izgradnji hiperprostorske obvoznice, če dekle, ki ga ljubiš, izgine v nerazumljivem nesporazumu o naravi prostor-časa, če vesoljska ladja, na kateri potuješ, strmoglavi in zgori na oddaljenem planetu in če je vse, na kar se lahko zaneseš, skromno znanje priprave sendvičev. Kakor koli že, namesto da bi Arthur Dent izgubil vso voljo, ki mu je še ostala, naredi pošastno napako in začne vsaj malo uživati življenje. Takoj izbruhne katastrofa.
Keywords: elektronske knjige
Published in DKUM: 30.12.2015; Views: 1136; Downloads: 44
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7. Zbogom in hvala za vse ribeDouglas Adams, 2015 Abstract: Knjiga vključuje vse, kar ste hoteli vedeti o prvih treh knjigah, a si niste drznili vprašati. Na koncu knjige O Življenju, Vesolju in sploh Vsem Arthur Dent izve za naslov, na katerem se nahaja Poslednje božje sporočilo stvarstvu. A žal pozabi ta pomemben podatek. Ko se znajde na planetu, ki bi lahko bila Zemlja, sreča dekle svojih sanj in se ima z njo prav v redu, a ju tare kar nekaj vprašanj, na katera si želita odgovoriti, med drugimi, kam so izginili vsi delfini in kje se nahaja Poslednje božje sporočilo.
Keywords: znanstvena fantastika, angleška književnost, 20.st., elektronske knjige
Published in DKUM: 30.12.2015; Views: 1786; Downloads: 64
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10. x-ray absorption study of CeO2 and Ce/V mixed oxide thin films obtained by sol-gel depositionJana Padežnik Gomilšek, Irena Kozjek-Škofic, Nataša Bukovec, Alojz Kodre, 2004, original scientific article Abstract: CeO2 and Ce/V mixed oxide thin films prepared by sol-gel deposition and annealed in an air or argon atmosphere have been studied by chronocoulometry and by XAFS (X-ray absorption fine structure). Multielectron photoexcitations (MPE), well known to pervade XAFS spectra of Ce making the analysis of structural parameters unreliable, are removed with the help of the atomic absorption background, determined on simple Ce compounds. Distinct MPE estimates for Ce3+ and Ce4+ ions are used. In the analysis of the recovered pure XAFS signal, the degree of disorder is found to depend on the Ce/V molar ratio and on the heating atmosphere. The disorder correlates with charge capacity of films, both increasing with vanadium content and V4+/V5+ molar ratio.
Keywords: thin flms, cerium dioxide, cerium-vanadium mixed oxide, x-ray absorption, electrochemistry, sol-gel technology, XSAFS
Published in DKUM: 01.06.2012; Views: 2429; Downloads: 100
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