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A modified electron bombardment type ion source suitable for use with mass spectrometer is described. Ion formation occurs
throughout a relatively large volume in the ionisation box, since no magnetic field is used to collimate the ionising electrons.
A sensitivity of 2 × 10−5 amp/torr is obtained for an ion extraction energy of 2 keV and 200 mass resolution. Trajectory tracing has been used to study
the operation of the ion source. Capability of the ion source to analyse solid samples in microgram quantity was tested by
studying evaporation of BaO from tungsten. 相似文献
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N. R. Bulakh S. V. Ghaisas S. A. Kulkarni S. M. Kanetkar S. B. Ogale S. K. Date 《Hyperfine Interactions》1988,41(1):641-644
Oxide layers are produced on iron surface, under discharge in water ambient, applying both anodic and cathodic potentials
to iron foil. Non-stoichiometric Fe1−xO containing different ratios of Fe3+ and Fe2+ has been detected by using CEMS. Corrosion of these samples in 0.5 M H2SO4 shows that, cathodically discharge treated iron foil has higher corrosion resistance as compared to the anodically treated
sample. This is attributed to the microstructural differences in the Fe1−xOx films formed during the discharge. 相似文献
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S. Chakraborty S.V. Ghaisas C. Majumder 《The European Physical Journal B - Condensed Matter and Complex Systems》2012,85(7):1-9
We analyzed localized charge time evolution in the system of two interacting quantum dots (QD) (artificial molecule) coupled with the continuous spectrum states. We demonstrated that Coulomb interaction modifies relaxation rates and is responsible for non-monotonic time evolution of the localized charge. We suggested new mechanism of this non-monotonic charge time evolution connected with charge redistribution between different relaxation channels in each QD. 相似文献
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Resistance changes in thin films of copper, aluminium and bismuth have been studied under the bombardment of nitrogen, carbon
and argon ions. Variations in resistance with implantation dose have been observed upto doses of ∼ 3 × 1017 ions/cm2 for ion energies in the range 40 to 120 keV. The results are discussed in terms of desorption of gases from the film and
a composite action of sputter removal of the film and its structural changes upon ion bombardment. A simple theoretical model
is discussed which can qualitatively explain the experimental observations. 相似文献
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(3+2) Annulation of Amidinothioureas with Binucleophile: Synthesis and Antimicrobial Activity of 3‐Phenylamino‐5‐aryl/alkyl‐1,2,4‐oxadiazole Derivatives
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Swapnil G. Yerande Amruta B. Ghaisas Kiran M. Newase Wei Wang Kan Wang Alexander Dömling 《Journal of heterocyclic chemistry》2014,51(6):1752-1756
Herein, we report an efficient method for preparation of 3‐phenylamino‐5‐aryl/alkyl‐1,2,4‐oxadiazole by (3+2) annulation of amidinothioureas with binucleophilic hydroxylamine hydrochloride in the presence of mercury (II) chloride. Desired 3‐phenylamino‐5‐aryl/alkyl‐1,2,4‐oxadiazole was prepared in good to moderate yields. On the basis of the literature precedence, the mechanism for the formation of 3‐phenylamino‐5‐aryl/alkyl‐1,2,4‐oxadiazole is proposed. The synthesized compounds were tested for their antimicrobial activity and showed promising inhibition of Gram‐positive bacteria (Staphylococcus aureus) and fungi (Candida albicans). 相似文献