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Author: william wallace

Displaying records 31 to 40 of 94 records.
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31. Analysis by Mass Spectrometry of the Hydrolysis/Condensation Reaction of a Trialkoxysilane in Various Dental Monomer Solutions
Published: 1/1/2005
Authors: M Farahani, William E Wallace III, Joseph M Antonucci, Charles Martin Guttman
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853993

32. An Operator-Independent Approach to Mass Spectral Peak Identification and Integration
Published: 5/1/2004
Authors: William E Wallace III, Anthony J Kearsley, Charles Martin Guttman
Abstract: A mathematical algorithm is presented that accurately locates and calculates the area beneath mass spectral peaks using only reproducible mathematical operations and a NO user-selected sensitivity parameters. This represents a major refinement of la ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852207

33. International Interlaboratory Comparison of Mixtures of Polystyrenes With Different End Groups Obtained by Matrix Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry (MALDI-TOF-MS): Preliminary Results
Published: 1/1/2004
Authors: Charles Martin Guttman, S Wetzel, Kathleen M. Flynn, B M Fanconi, William E Wallace III, David Lloyd VanderHart
Abstract: NIST has sponsored a MALDI-TOF-MS interlaboratory comparison of mixtures of polymers of the same repeat unit with closely matching molecular masses but with different end groups. This interlaboratory comparison was designed to see how well a group of ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852364

34. Mass Spectrometry of Synthetic-Polymer Mixtures Workshop.
Published: 1/1/2004
Authors: William E Wallace III, Charles Martin Guttman, S Wetzel, S D Hanton
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=853903

35. Recent Advances in Quantitative Synthetic-Polymer Mass Spectrometry at NIST
Published: 1/1/2004
Authors: William E Wallace III, Charles Martin Guttman
Abstract: Commensurate with NIST s mission to advance the state of quantitative measurement science we have worked to develop a method to determine absolute molecular mass distribution of synthetic polymers by mass spectrometry. Work has centered on using mat ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852391

36. Understanding and Optimizing the MALDI Process Using a Heated Sample Stage: a 2,5-Dihydroxybenzoic Acid Study
Published: 1/1/2004
Authors: Mark Arnould, William E Wallace III, R Knochenmuss
Abstract: Since its use as a compound for matrix assisted laser desorption/ionization (MALDI), 2,5 dihydroxybenzoic acid (DHB) has been the subject of many solid state and gas phase studies. Here, the temperature of DHB during LD experiments was raised from + ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852390

37. Certification of a Polystyrene Synthetic Polymer, SRM 2888
Series: Special Publication (NIST SP)
Report Number: 260-152
Published: 11/1/2003
Authors: Charles Martin Guttman, William R. Blair, B M Fanconi, R J Goldschmidt, William E Wallace III, S Wetzel, David Lloyd VanderHart
Abstract: The certification of a polystyrene standard reference material, SRM 2888, is described. The M^dw^ of SRM 2888 was determined by light scattering to be 7.19 x 10^u+3^ g/mol with a sample standard deviation of 0.14 x 10^u+3^ g/mol. A combined expanded ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852132

38. A Direct Comparison of Surface and Bulk Chain-Relaxation in Polystyrene
Published: 9/1/2003
Authors: Wen-Li Wu, S Sambasivan, C M Wang, William E Wallace III, Jan Genzer, Daniel A Fischer
Abstract: Near-edge x-ray absorption fine structure (NEXAFS) spectroscopy was used to meausre simultaneously the relaxation rates of polystyrene (PS) molecules at the free surface and in the bulk. The samples were uniaxially stretched and annealed at temperatu ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852179

39. MALDI-TOF MS Characterization of Covalent Cationized Polyethylene
Published: 8/1/2003
Authors: Sheng Lin-Gibson, D L Brunner, David Lloyd VanderHart, Barry J. Bauer, B M Fanconi, Kathleen M. Flynn, William E Wallace III
Abstract: MALDI-TOF MS generally uses metal salts to cationize synthetic polymers, such as polystyrene. However, reduced analyte signal often results from complications during the metal ionization processes in the gas phase including competition between the a ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852120

40. Resonant Soft X-Ray Photofragmentation of Propane
Published: 7/1/2003
Authors: William E Wallace III, Daniel A Fischer
Abstract: A comparison was made between the mass spectra of propane (CH6d3^CH^d2^CH^d3^) for resonant soft X-ray photofragmentation and electron-impact ionization. The soft X-ray photon energy was tuned to 287.7 eV to promote Auger relaxations from the C-H bo ...
http://www.nist.gov/manuscript-publication-search.cfm?pub_id=852055



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