Linked Life Data

12132535

Source:http://linkedlifedata.com/resource/pubmed/id/12132535

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
22
pubmed:dateCreated
2002-7-19
pubmed:abstractText
The dependence of the mobilities of gas-phase ions on electric fields from 0 to 90 Td at ambient pressure was determined for protonated monomers [(MH+(H2O)n] and proton bound dimers [M2H+(H2O)n] for a homologous series of normal ketones, from acetone to decanone (M=C3H6O to C10H20O). This dependence was measured as the normalized function of mobility alpha (E/N) using a planar field asymmetric waveform ion mobility spectrometer (PFAIMS) and the ions were mass-identified using a PFAIMS drift tube coupled to a tandem mass spectrometer. Methods are described to obtain alpha (E/N) from the measurements of compensation voltage versus amplitude of an asymmetric waveform of any shape. Slopes of alpha for MH+ versus E/N were monotonic from 0 to 90 Td for acetone, butanone, and pentanone. Plots for ketones from hexanone to octanone exhibited plateaus at high fields. Nonanone and decanone showed plots with an inversion of slope above 70 Td. Proton bound dimers for ketones with carbon numbers greater than five exhibited slopes for alpha versus E/N, which decreased continuously with increasing E/N. These findings are the first alpha values for ions from a homologous series under atmosphere pressure and are preliminary to explanations of alpha (E/N) with ion structure.
pubmed:keyword
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
S
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Jun
pubmed:issn
1089-5639
pubmed:author
pubmed:issnType
Print
pubmed:day
6
pubmed:volume
106
pubmed:owner
NASA
pubmed:authorsComplete
Y
pubmed:pagination
5437-44
pubmed:dateRevised
2007-3-27
pubmed:meshHeading
pubmed:year
2002
pubmed:articleTitle
Field dependence of mobilities for gas-phase-protonated monomers and proton-bound dimers of ketones by planar field asymmetric waveform ion mobility spectrometer (PFAIMS).
pubmed:affiliation
Department of Chemistry and Biochemistry, New Mexico State University, Las Cruces, New Mexico 88003, USA.
pubmed:publicationType
Journal Article, Research Support, U.S. Gov't, Non-P.H.S., Research Support, Non-U.S. Gov't