1500 Sw 10Th Ave Please Select
Topeka KS 66604
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License #: 2010024960
Taxonomy Codes:207P00000X 390200000X
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Penning traps with unitary architecture for storage of highly charged ions. - The Review of scientific instruments
Penning traps are made extremely compact by embedding rare-earth permanent magnets in the electrode structure. Axially-oriented NdFeB magnets are used in unitary architectures that couple the electric and magnetic components into an integrated structure. We have constructed a two-magnet Penning trap with radial access to enable the use of laser or atomic beams, as well as the collection of light. An experimental apparatus equipped with ion optics is installed at the NIST electron beam ion trap (EBIT) facility, constrained to fit within 1 meter at the end of a horizontal beamline for transporting highly charged ions. Highly charged ions of neon and argon, extracted with initial energies up to 4000 eV per unit charge, are captured and stored to study the confinement properties of a one-magnet trap and a two-magnet trap. Design considerations and some test results are discussed.
Absolute transition frequencies and quantum interference in a frequency comb based measurement of the (6,7)Li D lines. - Physical review letters
Optical frequencies of the D lines of (6,7)Li were measured with a relative accuracy of 5 Ã— 10â»Â¹Â¹ using an optical comb synthesizer. Quantum interference in the laser induced fluorescence for the partially resolved D2 lines was found to produce polarization dependent shifts as large as 1 MHz. Our results resolve large discrepancies among previous experiments and between all experiments and theory. The fine-structure splittings for â¶Li and â·Li are 10052.837(22) MHz and 10053.435(21) MHz. The splitting isotope shift is 0.599(30) MHz, in reasonable agreement with recent theoretical calculations.
Indirect and direct detection of the 4-(benzothiazol-2-yl)phenylnitrenium ion from a putative metabolite of a model anti-tumor drug. - Organic letters
2-(4-Aminophenyl)benzothiazoles related to 1 are potentially important pharmaceuticals. Metabolism apparently involves oxidation and esterification to 3. In water, hydrolysis and photolysis of 3 generates the nitrenium ion 4 that can be detected indirectly by N(3)(-) trapping and directly by UV-vis spectroscopy following laser flash photolysis. The transient, with lambda(max) 570 nm, and a lifetime of 530 ns, reacts with N(3)(-) at a diffusion-controlled rate and generates the quinol 6 by reaction with water.
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1500 Sw 10Th Ave Please Select Topeka, KS 66604