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Europium (Eu+) ions were confined in a Paul trap and detected by non-destructive method. Storage time of Eu+ ions achieved in vacuum was improved by orders of magnitude employing buffer gas cooling. The experimentally detected signal
was fitted to the ion response signal and the total number of ions trapped was estimated. It is found that the peak signal
amplitude as well as the product of FWHM and the peak signal amplitude is proportional to the total number of trapped ions.
The trapped ion secular frequency was swept at different rates and its effect on the absorption line profile was studied both
experimentally and theoretically. 相似文献
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Eliene O Kozlowski Paula C Lima Cristina P Vicente Tito Lotufo Xingfeng Bao Kazuyuki Sugahara Mauro SG Pavão 《BMC biochemistry》2011,12(1):1-2
After the publication of the work entitled "Dermatan sulfate in tunicate phylogeny: Order-specific sulfation pattern and the effect of [→4IdoA(2-Sulfate)β-1→3GalNAc(4-Sulfate)β-1→] motifs in dermatan sulfate on heparin cofactor II activity", by Kozlowski et al., BMC Biochemistry 2011, 12:29, we found that the legends to Figures 2 to 5 contain serious mistakes that compromise the comprehension of the work. This correction article contains the correct text of the legends to Figures 2 to 5. 相似文献
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S.M. Afzal S.G. Nakhate S.A. Ahmad 《Zeitschrift für Physik D Atoms, Molecules and Clusters》1996,37(3):249-253
Isotope shift (IS) Δσ (142–150) have been measured in 92 spectral lines of Nd+ in the region 3290–3955 Å, employing recording Fabry-Perot spectrometer and highly enriched isotopic samples excited in a liquid-nitrogen cooled hollow cathode. Earlier IS measurement in UV region of Nd II spectrum is available for only a few lines, New classification has been made for several of the spectral lines studied presently. We have also revised the earlier suggested classification for some of the Nd II lines on the basis of observed isotope shifts. The transitions presently studied mostly involve high lying odd parity energy levels above 30,000 cm?1 having neither electronic configuration assignment nor term isotope shifts (ΔT) evaluated. The present study would thus enable to evaluate ΔT values of some of these high lying odd levels, which should be helpful in suggesting possible electronic configurations. 相似文献
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S.G. Nakhate Sheo Mukund S. Bhattacharyya 《Journal of Quantitative Spectroscopy & Radiative Transfer》2010,111(3):394-225
Radiative lifetimes of 20 odd-parity excited energy levels in Zr I, out of which 10 for the first time, have been investigated in the energy range 17 400-29 300 cm−1. The levels belong to the 4d25s5p and 4d35p electronic configurations. Time-resolved laser-induced fluorescence spectroscopy technique in supersonic free-jet has been employed in the present work to circumvent the effects of collision in lifetime measurements. 相似文献
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Zygmunt J. Jakubek S.G. Nakhate Benoit SimardWalter J. Balfour 《Journal of Molecular Spectroscopy》2002,211(1):135-146
The yttrium monohydride spectrum in the range 12 500-25 000 cm−1 has been studied by various laser-induced fluorescence (LIF) techniques. YH (YD) molecules have been produced in a free jet molecular beam apparatus by a laser vaporizing yttrium metal in the presence of He doped with H2 (D2) or NH3 (ND3). Low-resolution (∼0.04 cm−1) excitation spectra have been recorded in the entire studied range. Four green bands (19 300-19 900 cm−1) of the YH isotopomer have been studied in more detail: (1) high-resolution (∼120 MHz, ∼0.004 cm−1) excitation spectra have been recorded, (2) dispersed fluorescence spectra have been obtained, and (3) lifetimes of the selected rotational levels of the upper states have been measured. Our observations have confirmed that the ground state of yttrium monohydride has 1Σ+ symmetry and have provided a link between the singlet and triplet manifolds. The upper states of the observed transitions have been tentatively assigned to five electronic states, d0+, f3Π, f′1, D1Π, E0+, and Fl. The low-energy excited electronic state observed in the dispersed fluorescence experiment has been assigned as the a3Δ state. 相似文献
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YN molecules were produced in a free jet molecular beam apparatus by a laser vaporizing yttrium metal in the presence of He doped with NH3. Laser excitation spectra were observed in the range 18 250-19 850 cm−1. The ground state was confirmed to have 1Σ+ symmetry. The fundamental vibration in the ground state was measured to be 650.6(1) cm−1. Three new electronic states, B1, C1, and D1, were observed at 18 974.7(1), 19 023.3(1), and 19 824.0(1) cm−1, respectively. The fundamental vibrations and equilibrium internuclear distances were found to be 718.3(1) cm−1 and 1.939(8) for the B1 state and 723.5(1) cm−1 and 1.9194(3) for the C1 state. Two additional electronic states were identified with the help of a deperturbation procedure, one of which is either the 1Σ+ or the 3Σ0− state. The newly observed electronic states cannot be accounted for based on the existing ab initio results. We expect that these states correlate with the excited asymptote Y(4d15s22D)+N(2D). 相似文献
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Dhansay Dewangan Kartik Nakhate Achal Mishra Alok Singh Thakur Harish Rajak Jaya Dwivedi Swapnil Sharma Sarvesh Paliwal 《Journal of heterocyclic chemistry》2019,56(2):566-578
A series of quinoxalinone derivatives were synthesized by the reaction of o‐phenylenediamine with oxalic acid to yield 1, 4‐dihydro quinoxaline‐2, 3‐dione ( 1 ) and then treated with thionyl chloride to yield 2, 3 dichloro quinoxaline ( 2 ). This was further reacted with hydrazine hydrate to produce 2, 3‐dihydrazinyl quinoxaline ( 3 ). This was finally reacted with substituted aromatic aldehydes to produce 2,3‐bis[2‐(sustituted benzylidine) hydrazinyl] quinoxalines ( 4 ). These quinoxalinone derivatives were characterized by infrared spectroscopy and nuclear magnetic resonance spectroscopy and MASS spectral data. All the synthesized compounds were evaluated for their antimicrobial activity. The results of the antimicrobial study revealed that compounds 4c , 4d , and 4i were active and exhibited better inhibitory activities as compared to standard drug ciprofloxacin. The results were further checked with protein legend interaction by using docking studies, and all the compounds exhibited good docking scores between ?8.72 and ?11.29 kcal/mol against dihydrofolate reductase protein fragment from Staphylococcus aureus (PDB ID‐4XE6). Among all compound, 4c has shown maximum docking score and found in agreement to in vitro studies. 相似文献