Zobrazeno 1 - 10
of 29
pro vyhledávání: '"Leon D. Betowski"'
Publikováno v:
International Journal of Mass Spectrometry. :123-129
Negative-ion chemical-ionization mass spectrometry (NICI MS) has the potential to be a very useful technique in identifying various polycyclic aromatic hydrocarbons (PAHs) in soil and sediment samples. Some PAHs give much stronger signals under NICI
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::895448f6e4fa94b555ffb1b1c35266b3
https://doi.org/10.1016/j.ijms.2006.04.008
https://doi.org/10.1016/j.ijms.2006.04.008
Autor:
Leon D. Betowski, Mark Enlow
Publikováno v:
Journal of Molecular Structure: THEOCHEM. 638:189-195
The experimental proton affinity of diborane (B 2 H 6 ) is based on an unstable species, B 2 H 7 + , which has been observed only at low temperatures. The present work calculates the proton affinity of diborane using the Gaussian-3 method and other h
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::9cb614bc8243fd376c6f15df6c1909c3
https://doi.org/10.1016/s0166-1280(03)00582-7
https://doi.org/10.1016/s0166-1280(03)00582-7
Publikováno v:
Computers & Chemistry. 26:371-377
Investigators using models to determine the phototoxic effects of sunlight on polycyclic aromatic hydrocarbons (PAHs) have invoked the excited states of the molecule as important in elucidating the mechanism of these reactions. Energies of actual exc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::29e451f7a2b4b769a18012a95fa36c76
https://doi.org/10.1016/s0097-8485(02)00002-5
https://doi.org/10.1016/s0097-8485(02)00002-5
Publikováno v:
International Journal of Mass Spectrometry. 201:283-295
The gas-phase basicities (GBs) of polynuclear aromatic hydrocarbons (PAHs) have been calculated using the semiempirical Austin model 1 method, ab initio quantum mechanical methods at the HF/3-21G, HF/6-31G(d), MP2/6-31G(d), MP2/6-31+G(d,p) levels, an
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1eed6672620fb10d39c95d5121d2807b
https://doi.org/10.1016/s1387-3806(00)00210-4
https://doi.org/10.1016/s1387-3806(00)00210-4
Publikováno v:
International Journal of Mass Spectrometry and Ion Processes. 173:27-39
Ab initio and density functional theory (DFT) calculations have been performed to determine the heats of reaction for the process C 16 H 10 + → C 10 H 2 + that takes place in an ion trap mass spectrometer. Comparisons have been made with the experi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c5557e1c7aa1bcb2fa7d4c352e0a2598
https://doi.org/10.1016/s0168-1176(97)00268-1
https://doi.org/10.1016/s0168-1176(97)00268-1
Publikováno v:
Environmental Science & Technology. 30:3558-3564
Groundwater at or near Superfund sites often contains much organic matter, as indicated by total organic carbon (TOC) measurements. Analyses by standard GC and GC/MS methodology often miss the more polar or nonvolatile of these organic compounds. The
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ac6a6ee12b475b6fdf5da2262ed9e7ce
https://doi.org/10.1021/es9602206
https://doi.org/10.1021/es9602206
Publikováno v:
Journal of Chromatography A. 724:207-217
An automated method for the determination of carbendazim in water that combines high-performance immunoaffinity chromatography (HPIAC), high-performance liquid chromatography (HPLC) in the reversed-phase mode, and detection by either UV-Vis diode arr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ebdc393d255a249ce73e5e2201200b54
https://doi.org/10.1016/0021-9673(95)00917-5
https://doi.org/10.1016/0021-9673(95)00917-5
Publikováno v:
Journal of Mass Spectrometry. 30:1574-1580
Sulfonylurea herbicides have been studied using negative-ion desorption chemical ionization (DCI) mass spectrometry (MS) and DCI-MS/MS techniques. Both [M H]− and M−· ions were observed in the DCI mass spectra. The collisionally activated dissoc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::08e6017bf6b9ec2a4218a499720e1e7a
https://doi.org/10.1002/jms.1190301109
https://doi.org/10.1002/jms.1190301109
Autor:
Christopher M. Pace, Leon D. Betowski
Publikováno v:
Journal of the American Society for Mass Spectrometry. 6:597-607
Polycyclic aromatic hydrocarbons (PAHs) comprise a class of potentially hazardous com- pounds of concern to the U.S. EPA. The application of particle-beam (PB) liquid chromatography-mass spectrometry (LC-MS) to the measurement of high-molecular-weigh
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::3cb54b6ac2231a8176c37e6772d18bdf
https://doi.org/10.1016/1044-0305(95)00249-d
https://doi.org/10.1016/1044-0305(95)00249-d
Autor:
Tammy L. Jones, Leon D. Betowski
Publikováno v:
Rapid Communications in Mass Spectrometry. 7:1003-1008
The organotins, mainly the trialkyltins and triphenyltins, have a widespread application as fungicides, anti-fouling coatings for porous and non-porous surfaces, herbicides, insecticides, and generic biocides. Traditional environmental monitoring met
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f451cb935c596af2ce90803a3a867a99
https://doi.org/10.1002/rcm.1290071108
https://doi.org/10.1002/rcm.1290071108