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Showing 1 to 8 of 8 for “"lifetime studies"”.
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Positron Annihilation lifetime studies of inorganic materials using a new positron beamline
… of a positron beamline for materials studies. This beamline, now operational, has been developed to measure the positron lifetime in a target material. This technique, referred to as Positron Annihilation Lifetime Spectroscopy (PALS), allows the size of open volume type defects (or …
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Positron Annihilation lifetime studies of inorganic materials using a new positron beamline
… of a positron beamline for materials studies. This beamline, now operational, has been developed to measure the positron lifetime in a target material. This technique, referred to as Positron Annihilation Lifetime Spectroscopy (PALS), allows the size of open volume type defects (or …
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Spectroscopic Studies of Chlorophyll a Complexes with Trinitro-Substituted Flourene Derivatives
Absorption, fluorescence, and excited-state lifetime studies of chlorophyll a (Chl a) with fluorene, 2-(2,4,7-Trinitro-fluoren-9-ylideneaminooxy)-propionic acid (TFPR), 2- (2,4,7-Trinitro-fluoren-9-ylidenemethyl)-phenol, (TFPH), and 9-Isopropylidene-2,4,7- trinitro-9H-fluorene (ITNF) have been …
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Alternative strategies for security labelling/encoding of paper and plastic products.
… fluorescence signals and unique fluorescence lifetimes has been achieved with an in-situ detector. This has advantages over current fluorescent dye labels which have broadband spectra that quickly overlap each other reducing their number of permutations. Energy transfer between the dopants was …
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Spin and Charge Dynamics in Organic Semiconductors
… be done next to improve the insight gained. Spin lifetime investigations in TIPS-pentacene and diF-TES-ADT are presented in chapter 7 and appendix A with chapter 4 detailing electron spin resonance and its use in spin lifetime studies. We present the full fabrication procedure to obtain ESR …
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Catalysts for the Positional Isomerization of Internal, Long-Chain Olefins
… acidic zeolites. Selected catalysts underwent lifetime studies. Oversulfonated PS-DVBs (e.g., Amberlyst 35) were reasonably selective with long lifetimes, only gradually deactivating due to poisoning by surface oligomers. Amberlyst® 70, Amberlyst® XN1010, ZSM-35 and SAPO-11 were evaluated …
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Isomerisation of cresols over zeolites HZSM5, HBeta and HMordenite
… from o-cresol and m-cresol transformation, and lifetime studies of the preferred zeolite HZSM5. It is thus recommended to investigate CVD (chemical vapour deposition) to deactivate the external surface of the catalyst as well as noble metal impregnation and/or the use of hydrogen as a carrier …
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Synthesis and characterisation of mononuclear and dinuclear rhenium carbonyl complexes
… Again, spectroscopic and clcctrochemical studies display a strong pH dependency. Chapter Four describes the synthesis and characterisation of the homo-nuclear rhenium(I) dimer and the hetero-nuclear ruthenium(H)-rhenium(I) dinuclear complexes bridged by the triazole ligand Hbpt …