20.500.12556/DKUM-98528 Določevanje plinske sestave v celici za rentgensko absorpcijsko spektroskopijo iz meritev hitrosti ultrazvoka magistrsko delo Determination of gas composition inside a cell for x-ray absorption spectroscopy based on ultrasound velocity measurements V magistrskem delu predstavljamo razvoj, umeritev in uporabo ultrazvočnega merilnega sistema za določevanje plinske sestave v celici za rentgensko absorpcijsko spektroskopijo. Merilna metoda temelji na odvisnosti hitrosti ultrazvoka od sestave plinske mešanice. Z natančnim merjenjem hitrosti ultrazvoka smo uspeli izmeriti deleže posameznih hidridov elementov skupine 5p (SnH4, SbH3, TeH2 in HI) v produktnih plinih, ki predstavljajo vzorce za absorpcijske spektroskopske meritve na sinhrotronih v okviru raziskav na področju eksperimentalne atomske fizike. S prenosom plinske mešanice iz absorpcijske celice v ultrazvočno merilno celico smo na posredni način uspeli izmeriti časovne konstante za difuzijo helija in vodika iz notranjosti absorpcijske celice v okolico in na tej osnovi izboljšati njeno tesnjenje. Na podoben način smo izmerili časovne konstante upadanja deležev hidridov znotraj izboljšane rentgenske absorpcijske celice. Predstavljeni rezultati raziskave v okviru magistrske naloge bodo pripomogli k izboljšanju zanesljivosti nekaterih pridobljenih parametrov v že izmerjenih rentgenskih absorpcijskih spektrih. Izboljšanje tesnjenja absorpcijskih celic za plinaste vzorce z opisanimi meritvami lahko vpliva na uspešnost prihodnjih rentgenskih absorpcijskih meritev in lahko predstavlja, skupaj z opisano UZ merilno metodo, novi korak v razvoju intrumentalizacije sinhrotronskih rentgenskih absorpcijskih meritev na nestabilnih plinastih vzorcih. This master's thesis presents the development, calibration, and application of an ultrasonic measurement system for determining the gas composition inside a cell used for X-ray absorption spectroscopy. The measurement method is based on the dependence of the speed of sound on the composition of a gas mixture. By accurately measuring the speed of ultrasound, we determined the concentrations of gaseous hydrides of 5p-group elements (SnH₄, SbH₃, TeH₂, and HI) in the product gases used as samples for synchrotron-based X-ray absorption spectroscopy experiments in the field of experimental atomic physics. By transferring the gas mixture from the absorption cell to the ultrasonic measurement cell, we indirectly determined the time constants governing the diffusion of helium and hydrogen from the interior of the absorption cell into the surrounding environment. Based on these measurements, we improved the sealing performance of the absorption cell. Using a similar approach, we also measured the time constants describing the decrease in hydride concentrations inside the improved X-ray absorption cell. The results presented in this thesis contribute to improving the reliability of certain parameters obtained from previously measured X-ray absorption spectra. The improved sealing of absorption cells for gaseous samples achieved through the described measurements may enhance the quality of future X-ray absorption spectroscopy experiments. Together with the developed ultrasonic measurement method, this work represents a further step in the development of instrumentation for synchrotron-based X-ray absorption spectroscopy studies of unstable gaseous samples. hitrost ultrazvoka v plinih določevanje plinske sestave rentgenska absorpcijska spektroskopija absorpcijska celica za plinaste vzorce difuzija plinov plinasti hidridi sinhrotronske meritve speed of sound in gases gas composition determination X-ray absorption spectroscopy absorption cell for gaseous samples gas diffusion gaseous hydrides synchrotron measurements true true false [K. Korže] Slovenski jezik Angleški jezik Magistrsko delo/naloga 2026-06-18 11:18:03 2026-07-20 12:05:07 2026-07-21 03:10:01 0000-00-00 00:00:00 2026 0 Maribor 0 Maribor 39 f. 0000-00-00 NiDoloceno NiDoloceno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 53(043.2) 285414403 MAG_Korze_Klemen_2026.pdf MAG_Korze_Klemen_2026.pdf 1 C2E0146B051791F80AD5B054CB7C404B ba0f5e46e3ef82047895361541c2a1ea7094d67a51796dc770db5075874fc4b4 31f8b26a-7ac0-11f1-8a43-00155d580e34 https://dk.um.si/Dokument.php?lang=slv&id=208071 Fakulteta za naravoslovje in matematiko 0 0 0