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Full-Text Articles in Social and Behavioral Sciences
Photoelectron-Photofragment Coincidence Studies Of No-_X Clusters (X = H2o, Cd4), Berwyck Poad, Christopher Johnson, Robert Continetti
Photoelectron-Photofragment Coincidence Studies Of No-_X Clusters (X = H2o, Cd4), Berwyck Poad, Christopher Johnson, Robert Continetti
Berwyck L. J. Poad
The dissociative photodetachment of NO -(H2O)and NO -(CD4) anion clusters was studied at 775 nm (1.60 eV) using photoelectron-photofragment coincidence spectroscopy. The correlation between the photoelectron and photodetached neutral spectra indicates vibrational excitation in the recoiling NO neutral fragments from NO-(H2O), with a progression consistent with vibrational excitation up to v(NO) = 3 in the products. The correlation remains when D2O is substituted for H2O, implying the NO vibrational mode plays a role in the dissociation coordinate of the complex. In contrast, no correlation was observed between photoelectron kinetic …
Ozone-Induced Dissociation On A Modified Tandem Linear Ion-Trap: Observations Of Different Reactivity For Isomeric Lipids, Berwyck Poad, Huong Pham, Michael Thomas, Jessica Hughes, J Campbell, Todd Mitchell, Stephen Blanksby
Ozone-Induced Dissociation On A Modified Tandem Linear Ion-Trap: Observations Of Different Reactivity For Isomeric Lipids, Berwyck Poad, Huong Pham, Michael Thomas, Jessica Hughes, J Campbell, Todd Mitchell, Stephen Blanksby
Berwyck L. J. Poad
Ozone-induced dissociation (OzID) exploits the gas-phase reaction between mass-selected lipid ions and ozone vapor to determine the position(s) of unsaturation. In this contribution, we describe the modification of a tandem linear ion-trap mass spectrometer specifically for OzID analyses wherein ozone vapor is supplied to the collision cell. This instrumental configuration provides spatial separation between mass-selection, the ozonolysis reaction, and mass-analysis steps in the OzID process and thus delivers significant enhancements in speed and sensitivity (ca. 30-fold). These improvements allow spectra revealing the double-bond position(s) within unsaturated lipids to be acquired within 1 s: significantly enhancing the utility of OzID in …
Mixing Laser Spectroscopy And Mass Spectrometry- Infrared Spectra Of Metal Cation- Hydrogen Complexes, Vikoras Dryza, Berwyck Poad, Evan Bieske
Mixing Laser Spectroscopy And Mass Spectrometry- Infrared Spectra Of Metal Cation- Hydrogen Complexes, Vikoras Dryza, Berwyck Poad, Evan Bieske
Berwyck L. J. Poad
We describe recent experiments in which mass spectrometry and laser spectroscopy are combined to characterize Li(+)-H(2), Na(+)-H(2), B(+)-H(2), and Al(+)-H(2) complexes in the gas-phase. The infrared spectra, which feature full resolution of rotational sub-structure, are recorded by monitoring M(+) photo fragments as the infrared wavelength is scanned. The spectra deliver detailed information on the way in which a hydrogen molecule is attached to a metal cation including the intermolecular separation, the force constant for the intermolecular bond and the H-H stretching frequency. The complexes all possess T-shaped equilibrium geometries and display a clear correlation between the length and force constant …
Attaching Molecular Hydrogen To Metal Cations: Perspectives From Gas-Phase Infrared Spectroscopy, Viktoras Dryza, Berwyck Poad, Evan Bieske
Attaching Molecular Hydrogen To Metal Cations: Perspectives From Gas-Phase Infrared Spectroscopy, Viktoras Dryza, Berwyck Poad, Evan Bieske
Berwyck L. J. Poad
In this perspective article we describe recent infrared spectroscopic investigations of mass-selected M+–H2 and M+–D2 complexes in the gas-phase, with targets that include Li+–H2, B+–H2, Na+–H2, Mg+–H2, Al+–H2, Cr+–D2, Mn+–H2, Zn+–D2 and Ag+–H2. Interactions between molecular hydrogen and metal cations play a key role in several contexts, including in the storage of molecular hydrogen in zeolites, metal–organic frameworks, and …
Infrared Spectra Of Cl-_(C6h6)Mm=1, 2, Christopher Thompson, Berwyck Poad, Corinna Emmeluth, Evan Bieske
Infrared Spectra Of Cl-_(C6h6)Mm=1, 2, Christopher Thompson, Berwyck Poad, Corinna Emmeluth, Evan Bieske
Berwyck L. J. Poad
The Cl--(C6H6)Arn n = 0,1,2 and Cl--(C6H6)2 complexes are investigated using photodissociation infrared spectroscopy in the CH stretch region and through ab initio calculations at the MP2/aug-cc-pVDZ level. The results indicate that Cl--C6H6 possesses a planar structure in which the benzene molecule is attached to the Cl- anion by a double hydrogen bond. The calculations predict that Cl (C6H6)2 has a C2 symmetry structure in which the two face-to-face benzene molecules are attached to …