Summary Spark-source mass spectrometry was used for the determination of oxygen in gallium. Specially formed electrodes made of oxygen standard in gold matrix provided the possibility of baking the source together with the sample and obtaining a reliable comparison of line blackenings for the evaluation of results. The method was used for the detection of oxygen in gallium in the range of 8 to 200 ppmw.
Bestimmung von Sauerstoff in Gallium mit der Funken-Massenspektrometrie
Zusammenfassung Die Funken-Massenspektrometrie ist für die Bestimmung des Sauerstoffgehalts in Gallium eingesetzt worden. Mit speziell geformten Elektroden aus Gold mit bekannten Anteilen an Sauerstoff war es möglich, die Ionenquelle zusammen mit der Probe auszuheizen und über einen zuverlässigen Vergleich der Linienschwärzungen den Sauerstoffanteil der Probe zu erhalten. Diese Methode wurde eingesetzt, um Sauerstoffgehalte in Gallium zwischen 8 und 200 ppmw zu bestimmen.
Laser induced backside wet etching (LIBWE) is a promising laser direct-write technique for etching transparent materials and for producing high precision and near-optical quality surfaces. In this study, visible LIBWE using gallium and eutectic indium/gallium as absorbers was used for crack-free microfabrication of sodalime and quartz. Eutectic indium/gallium (In/Ga) has a melting temperature lower than metallic gallium does and the etching rate by using In/Ga was found to be similar to that by gallium for visible LIBWE. When using the gallium absorber, the etching threshold of quartz by visible LIBWE was about one-third of that by UV LIBWE. The heat-affected zone of the quartz etching was negligible at the trench rim in the visible LIBWE process. The wettability of the metallic absorbers on the substrates affects aspect ratio and is a new important factor for LIBWE. In addition, etching rate decreased when repetition rate was increased. 相似文献
An efficient and simple synthesis approach to form stable 68Ga‐labeled nanogels is reported and their fundamental properties investigated. Nanogels are obtained by self‐assembly of amphiphilic statistical prepolymers derivatised with chelating groups for radiometals. The resulting nanogels exhibit a well‐defined spherical shape with a diameter of 290 ± 50 nm. The radionuclide 68Ga is chelated in high radiochemical yields in an aqueous medium at room temperature. The phagocytosis assay demonstrates a highly increased internalization of nanogels by activated macrophages. Access to these 68Ga‐nanogels will allow the investigation of general behavior and clearance pathways of nanogels in vivo by nuclear molecular imaging.
Indium phosphide sample was irradiated with 200?MeV Ag9+ ions for the fluence of 2?×?1013?ions?cm?2. The sample was chemically etched down up to 240?nm depth to investigate the distribution of defects at different regions. Raman scattering and glancing incidence X-ray diffraction spectra were recorded at different depths. The stress estimated from Raman shift was found to increase with depth up to 160?nm and thereafter it decreased and at a depth of 224?nm sample did not show any stress. Phonon coherence length estimated from the Phonon Confinement Model was found to vary between 43 and 18?nm with respect to depth. Glancing incidence X-ray diffraction results revealed the decrease in crystallite size from 16.12 to 1.00?nm in different depth regions. 相似文献
Abstract The infrared and ultraviolet absorption spectra of toluene-d have been investigated for the first time in the regions 400 - 4000 cm?1 and 2350 ?2750 A° respectively. The intense band at 2666.3 A°(37494 cm?1) in the u.v. vapour absorption spectrum has been identified as the o,o band and others have been interpreted in terms of the three (519,632 and 785 cm?1) ground state and the six (454,526,743,935,963 and 1180 cm?1 excited state fundamentals. The correlation of the various frequencies of the ground and excited states of toluene and toluene-d has been done. The observed isotopic shift for toluene-d is 14 cm?1. 相似文献
For the fast characteristics of mixtures of Aluminium, Gallium and Indium the fluorimetric evaluation in the form of complexes
with 8-Hydroxyquinoline-5-sulphonic acid is described at selected pH. The highly collinear correlated fluorescent spectra
and their first derivation were evaluated under various experimental conditions with the Multiple Linear Regression (MLR),
Partial Least Squares (PLS) methods and Kalman filtering. When comparing the results, the PLS gives the least relative prediction
errors under optimal conditions, 5.6–15.9% for the concentration range of Al 0.025–0.2 μg cm−3, Ga 0.1–0.8 μg cm−3 and In 0.1–0.8 μg cm−3 in the mixture. 相似文献
Hydrogallation of Me3Si–C≡C–NR'2 with R2Ga–H (R = tBu, CH2tBu, iBu) yielded Ga/N‐based active Lewis pairs, R2Ga–C(SiMe3)=C(H)–NR'2 ( 7 ). The Ga and N atoms adopt cis‐positions at the C=C bonds and show weak Ga–N interactions. tBu2GaH and Me3Si–C≡C–N(C2H4)2NMe afforded under exposure of daylight the trifunctional digallium(II) compound [MeN(C2H4)2N](H)C=C(SiMe3)Ga(tBu)–Ga(tBu)C(SiMe3)=C(H)[N(C2H4)2NMe] ( 8 ), which results from elimination of isobutene and H2 and Ga–Ga bond formation. 8 was selectively obtained from the ynamine and [tBu(H)Ga–Ga(H)tBu]2[HGatBu2]2. 7a (R = tBu; NR'2 = 2,6‐Me2NC5H8) and H8C4N–C≡N afforded the adduct tBu2Ga‐C(SiMe3)=C(H)(2,6‐Me2NC5H8) · N≡C–NC4H8 ( 11 ) with the nitrile bound to gallium. The analogous ALP with harder Al atoms yielded an adduct of the nitrile dimer or oligomers of the nitrile at room temperature. The reaction of 7a with Ph–N=C=O led to the insertion of two NCO groups into the Ga–Cvinyl bond to yield a GaOCNCN heterocycle with Ga bound to O and N atoms ( 12 ). 相似文献
In this paper we report on facile solution combustion synthesis of erbium doped β-Ga2O3 with urea as fuel. The product was characterized using powder X-ray diffraction and transmission electron microscopy (TEM). X-ray diffraction and TEM showed that the material is nanostructured. Luminescence properties of β-Ga2O3:Er are studied with excitation in near infrared (Nd:YAG laser at 1064 nm) and visible (argon laser at 514.5 nm). A strong NIR emission of Er3+ in the window of minimal optical loss in silica based optical fibers, due to the 4I13/2→4I15/2 transition at 1.55 μm has been observed. Codoping with Yb3+ significantly increases the intensity of that important emission. 相似文献