David Labrecque

University of Maine | UM · Department of Chemistry

Low-mass cut-off restrictions for injecting ions from external ion sources into high magnetic fields impose limitations for wide mass range analyses with Fourier transform ion cyclotron resonance (FTICR) instruments. Radio-frequency (RF)-only quadrupole ion guides (QIGs) with higher frequencies can be used to overcome low-mass cut-off in FTICR inst...

Proceedings of the 61st ASMS Conference on Mass Spectrometry and Allied Topics

Due to the rising demand for low-cost clean energy, the development of efficient wind and water energy-generating systems is one of the major goals of this century. A novel approach for extracting energy efficiently from wind and water currents utilizes a tail-weighted wing following a figure-eight trajectory. Our prototype consists of a vertical r...

InterChemNet (ICN) is a Web-based management program designed to foster active learning in the laboratory. The system allows students choices of discovery-based experiments, a host of background information, and quick and easy access to UV–visible and FTIR spectrometers. The system creates individualized pathways for students by allowing instructor...

We report on the heterobimetallic system, Eu[Ag(x)Au(1-x)(CN)(2)](3) (x = 0-1) in which sensitization of europium luminescence occurs by energy transfer from [Ag(x)Au(1-x)(CN)(2)](-) donor excited states. The donor states have energies which are tunable and dependent on the Ag/Au stoichiometric ratio. These layered systems exhibit interesting prope...

Intensity fluctuations of 20 pulsars at 0.43 GHz are analyzed over a 4 yr time span. The objects were selected from a long-term timing study of pulsars performed at the Arecibo Observatory covering a range of dispersion measures between 8 and 403 pc/cc. A structure function analysis was used to determine the characteristic time scales and modulatio...

The dielectric properties of wet and dry natural snow were studied in the frequency range of 50 Hz to 1 00 kHz to determine whether measurements made in this frequency range might prove useful in evaluating the water content of snow. Dielectric heating at 20 kHz proved a very useful means of modifying the water content from 0 to 30% by weight. Six...