Advanced Search
Display options
Filter resources
Text Availability
Article type
Publication date
Species
Language
Sex
Age
Showing 13 to 24 of 265 entries
Sorted by: Best Match Show Resources per page
Pulsed fluorescence measurements of trapped molecular ions with zero background detection.

Journal of the American Society for Mass Spectrometry

Khoury JT, Rodriguez-Cruz SE, Parks JH.
PMID: 12056569
J Am Soc Mass Spectrom. 2002 Jun;13(6):696-708. doi: 10.1016/S1044-0305(02)00364-1.

Sensitive methods have been developed to measure laser-induced fluorescence from trapped ions by reducing the detection of background scattering to zero levels during the laser excitation pulse. The laser beam diameter has been reduced to approximately 150 microm to...

Sandia octahedral molecular sieves (SOMS): structural and property effects of charge-balancing the M(IV)-substituted (M = Ti, Zr) Niobate framework.

Journal of the American Chemical Society

Nyman M, Tripathi A, Parise JB, Maxwell RS, Nenoff TM.
PMID: 11853447
J Am Chem Soc. 2002 Feb 27;124(8):1704-13. doi: 10.1021/ja017081z.

Sandia octahedral molecular sieves (SOMS) is an isostructural, variable composition class of ion exchangers with the general formula Na(2)Nb(2-x)M(IV)(x)O (6-x)(OH)(x).H(2)O (M(IV) = Ti, Zr; x = 0.04-0.40) where up to 20% of the framework Nb(V) can be substituted with...

Experimental and theoretical methods to investigate extraframework species in a layered material of dodecaniobate anions.

Inorganic chemistry

Nyman M, Larentzos JP, Maginn EJ, Welk ME, Ingersoll D, Park H, Parise JB, Bull I, Bonhomme F.
PMID: 17298051
Inorg Chem. 2007 Mar 19;46(6):2067-79. doi: 10.1021/ic061454l. Epub 2007 Feb 14.

The highly charged dodecaniobate Keggin ions [XNb12O40](-16) (X = Si, Ge) and [XNb12O40](-15) (X = P) serve as building blocks of self-assembled, low-dimensional anionic framework materials. In addition to its high charge, the Keggin ion provides optimal binding geometries...

Quantitative high-pressure pair distribution function analysis.

Journal of synchrotron radiation

Parise JB, Antao SM, Michel FM, Martin CD, Chupas PJ, Shastri SD, Lee PL.
PMID: 16120977
J Synchrotron Radiat. 2005 Sep;12:554-9. doi: 10.1107/S0909049505022612. Epub 2005 Aug 16.

The collection of scattering data at high pressure and temperature is now relatively straightforward thanks to developments at high-brightness synchrotron radiation facilities. Reliable data from powders, that are suitable for structure determination and Rietveld refinement, are routinely collected up...

The structures of Ag55+ and Ag55- : trapped ion electron diffraction and density functional theory.

Nano letters

Schooss D, Blom MN, Parks JH, v Issendorff B, Haberland H, Kappes MM.
PMID: 16218720
Nano Lett. 2005 Oct;5(10):1972-7. doi: 10.1021/nl0513434.

We report the experimental structure determination of cold, mass selected Ag(55)(+/-) cluster ions using the recently developed technique of trapped ion electron diffraction. By comparison of experimental and theoretical molecular scattering functions and consideration of computed total energies, we...

THE TEXAS ACADEMY OF SCIENCE.

Science (New York, N.Y.)

Parks HB.
PMID: 17831527
Science. 1933 Jun 09;77(2006):565. doi: 10.1126/science.77.2006.565.

No abstract available.

Elasticity of agr-Cristobalite: A Silicon Dioxide with a Negative Poisson's Ratio.

Science (New York, N.Y.)

Yeganeh-Haeri A, Weidner DJ, Parise JB.
PMID: 17740733
Science. 1992 Jul 31;257(5070):650-2. doi: 10.1126/science.257.5070.650.

Laser Brillouin spectroscopy was used to determine the adiabatic single-crystal elastic stiffness coefficients of silicon dioxide (SiO(2)) in the alpha-cristobalite structure. This SiO(2) polymorph, unlike other silicas and silicates, exhibits a negative Poisson's ratio; alpha-cristobalite contracts laterally when compressed...

Tribasic lead maleate and lead maleate: synthesis and structural and spectroscopic characterizations.

Inorganic chemistry

Bonhomme F, Alam TM, Celestian AJ, Tallant DR, Boyle TJ, Cherry BR, Tissot RG, Rodriguez MA, Parise JB, Nyman M.
PMID: 16212365
Inorg Chem. 2005 Oct 17;44(21):7394-402. doi: 10.1021/ic050611y.

We report on the synthesis and structure of tribasic lead maleate hemihydrate ([Pb4O3]C2H2(CO2)2.(1/2)H2O, TRIMAL) and lead maleate (PbC2H2(CO2)2, PBMAL). The structure of [Pb4O3]C2H2(CO2)2.(1/2)H2O, solved ab initio from X-ray powder diffraction data, consists of infinite slabs of edge-sharing OPb4 tetrahedra,...

Role of the hydroxyl-water hydrogen-bond network in structural transitions and selectivity toward cesium in Cs0.38(D1.08H0.54)SiTi2O7.(D0.86H0.14)2O crystalline silicotitanate.

Inorganic chemistry

Celestian AJ, Parise JB, Smith RI, Toby BH, Clearfield A.
PMID: 17291108
Inorg Chem. 2007 Feb 19;46(4):1081-9. doi: 10.1021/ic0611387.

The crystal structure of the selective Cs+ ion exchanger D1.6H0.4Ti2SiO7.D2.66H0.34O1.5, known as crystalline silicotitanate or CST, has been determined in both native (D-CST) and in the Cs+-exchanged forms ((Cs, D)-CST) from angle-dispersive and time-of-flight neutron diffraction studies. The final...

The structure of ferrihydrite, a nanocrystalline material.

Science (New York, N.Y.)

Michel FM, Ehm L, Antao SM, Lee PL, Chupas PJ, Liu G, Strongin DR, Schoonen MA, Phillips BL, Parise JB.
PMID: 17525301
Science. 2007 Jun 22;316(5832):1726-9. doi: 10.1126/science.1142525. Epub 2007 May 24.

Despite the ubiquity of ferrihydrite in natural sediments and its importance as an industrial sorbent, the nanocrystallinity of this iron oxyhydroxide has hampered accurate structure determination by traditional methods that rely on long-range order. We uncovered the atomic arrangement...

Photon scanning-tunneling microscopy of unstained Mammalian cells and chromosomes.

Applied optics

Meriaudeau F, Goudonnet JP, Carver E, Parks JE, Jacobson KB, Warmack RJ, Ferrell TL.
PMID: 18301559
Appl Opt. 1998 Nov 01;37(31):7276-88. doi: 10.1364/ao.37.007276.

The photon scanning-tunneling microscope (PSTM) yields optical topographical images of samples that are thin or that are transparent at the wavelength used. A range of sample sizes can be imaged extending to well below the diffraction limit for sufficiently...

The mechanism responsible for extraordinary Cs ion selectivity in crystalline silicotitanate.

Journal of the American Chemical Society

Celestian AJ, Kubicki JD, Hanson J, Clearfield A, Parise JB.
PMID: 18683931
J Am Chem Soc. 2008 Sep 03;130(35):11689-94. doi: 10.1021/ja801134a. Epub 2008 Aug 07.

Combining information from time-resolved X-ray and neutron scattering with theoretical calculations has revealed the elegant mechanism whereby hydrogen crystalline silicotitanate (H-CST; H2Ti2SiO7 x 1.5 H2O) achieves its remarkable ion-exchange selectivity for cesium. Rather than a simple ion-for-ion displacement reaction...

Showing 13 to 24 of 265 entries