Search Results - "Whitten, W. B"

Microfabricated quadrupole ion trap for mass spectrometer applications by Pau, S, Pai, C S, Low, Y L, Moxom, J, Reilly, P T A, Whitten, W B, Ramsey, J M

“…An array of miniaturized cylindrical quadrupole ion traps, with a radius of 20 microm, is fabricated using silicon micromachining using phosphorus doped…”
Get full text

Planar Geometry for Trapping and Separating Ions and Charged Particles by Pau, S, Whitten, W. B, Ramsey, J. M

“…A planar quadrupole ion trap is proposed. We have demonstrated an extremely large operating range by trapping ions and particles with mass-to-charge ratio…”
Get full text

Pulsed-Ionization Miniature Ion Mobility Spectrometer by Xu, Jun, Whitten, W. B, Ramsey, J. M

“…We have demonstrated a miniature ion mobility spectrometer (IMS) that employs single pulses of corona discharge ionization. IMS spectra of both positive and…”
Get full text

Confinement and Manipulation of Individual Molecules in Attoliter Volumes by Kung, C.-Y, Barnes, M. D, Lermer, N, Whitten, W. B, Ramsey, J. M

“…We report observation of fluorescence from individual rhodamine 6G molecules in streams of charged 1-μm-diameter water droplets. With this approach,…”
Get full text

Space Charge Effects on Resolution in a Miniature Ion Mobility Spectrometer by Xu, Jun, Whitten, William B, Ramsey, J. Michael

“…Miniaturization of ion mobility spectrometry (IMS) is expected to have many advantages, as well as difficulties, in the separation of chemical species at…”
Get full text

Direct observation of the evolution of the soot carbonization process in an acetylene diffusion flame via real-time aerosol mass spectrometry by Reilly, P.T.A, Gieray, R.A, Whitten, W.B, Ramsey, J.M

“…Real-time aerosol mass spectrometry was used to measure the size and composition of individual soot particles in an acetylene diffusion flame. This on-line…”
Get full text

The Elucidation of Charge-Transfer-Induced Matrix Effects in Environmental Aerosols Via Real-Time Aerosol Mass Spectral Analysis of Individual Airborne Particles by Reilly, P. T. A., Lazar, A. C., Gieray, R. A., Whitten, W. B., Ramsey, J. M.

“…Matrix effects in real-time aerosol mass spectrometry (RTAMS) were investigated using Standard Reference Materials (SRMs) obtained from the National Institute…”
Get full text

High-Efficiency Molecular Counting in Solution:  Single-Molecule Detection in Electrodynamically Focused Microdroplet Streams by Lermer, N, Barnes, M. D, Kung, C.-Y, Whitten, W. B, Ramsey, J. M

“…We report fluorescence detection of individual rhodamine 6G molecules using a linear quadrupole to focus streams of microdroplets through the waist of a…”
Get full text

Tandem Mass Spectrometry of Individual Airborne Microparticles by Reilly, P. T. A., Gieray, R. A., Yang, M., Whitten, W. B., Ramsey, J. M.

“…An apparatus for real-time MS/MS analysis of individual airborne microparticles by laser ablation in an ion trap is described. The performance has been…”
Get full text

Real-time detection of individual airborne bacteria by Gieray, R.A., Reilly, P.T.A., Yang, M., Whitten, W.B., Ramsey, J.M.

“…Airborne bacteria and bacterial spores were directly sampled by an ion trap mass spectrometer with an atmospheric pressure inlet system. Samples were…”
Get full text

Fullerene Evolution in Flame-Generated Soot by Reilly, P. T. A, Gieray, R. A, Whitten, W. B, Ramsey, J. M

“…Direct observation of the chemical evolution of flame-generated soot was demonstrated for the first time using real-time aerosol mass spectrometry. The data…”
Get full text

Real-Time Characterization of the Organic Composition and Size of Individual Diesel Engine Smoke Particles by Reilly, Peter T. A, Gieray, Rainer A, Whitten, William B, Ramsey, J. Michael

“…Real-time analysis of individual diesel engine exhaust particles was demonstrated using an ion trap mass spectrometer. Measurements were made on the nebulized…”
Get full text

Real-Time Surface Analysis of Individual Airborne Environmental Particles by Lazar, Alexandru C, Reilly, Peter T. A, Whitten, William B, Ramsey, J. Michael

“…Typically, in real-time aerosol mass spectrometry (RTAMS), individual airborne particles are ablated and ionized with a single focused laser pulse. This…”
Get full text

Direct Determination of Soil Surface-Bound Polycyclic Aromatic Hydrocarbons in Petroleum-Contaminated Soils by Real-Time Aerosol Mass Spectrometry by Rodgers, Ryan P, Lazar, Alexandru C, Reilly, Peter T. A, Whitten, William B, Ramsey, J. Michael

“…Soil surface-bound polycyclic aromatic hydrocarbons (PAHs) were identified by use of Real-Time Aerosol Mass Spectrometry (RTAMS) in two NIST standard research…”
Get full text

Tandem Mass Spectrometry of Uranium and Uranium Oxides in Airborne Particulates by Gieray, Rainer A, Reilly, Peter T. A, Yang, Mo, Whitten, William B, Ramsey, J. Michael

“…A method for detection of uranium in airborne microparticles in real time has been developed. Positive identification of uranium is achieved by isolating UO2+…”
Get full text

MALDI of Individual Biomolecule-Containing Airborne Particles in an Ion Trap Mass Spectrometer by Harris, William A, Reilly, Peter T. A, Whitten, William B

“…Individual airborne biomolecule-containing particles were detected and characterized in near real-time by matrix-assisted laser desorption/ionization (MALDI)…”
Get full text

Detecting Single Molecules in Liquids by Barnes, Michael D, Whitten, William B, Ramsay, J. Michael

“…The trade-offs between sample throughput and sensitivity in single-molecule fluorescence detection are discussed, and examples of different detection schemes…”
Get full text

Fluorescence of oriented molecules in a microcavity by Barnes, MD, Kung, CY, Whitten, WB, Ramsey, JM, Arnold, S, Holler, S

Get full text

Detection of single Rhodamine 6G molecules in levitated microdroplets by Barnes, Michael D, Ng, Kin C, Whitten, William B, Ramsey, J. Michael

“…Single rhodamine 6G molecules in levitated glycerol microdroplets have been detected with signal-to-noise ratios of less than 40 using CW laser-induced…”
Get full text

Fiber optic waveguides for time-of-flight optical spectrometry by Whitten, W. B, Ross, H. H

Get full text