Show simple item record

dc.contributor.authorOwens, Peter
dc.contributor.authorRyder, Alan G.
dc.contributor.authorBlamey, Nigel J.
dc.identifier.citationOwens, P,Ryder, AG,Blamey, NJF (2008) 'Frequency domain fluorescence lifetime study of crude petroleum oils'. Journal Of Fluorescence, 18 :997-1006.en_IE
dc.descriptionJournal articleen_IE
dc.description.abstractFrequency domain (FD) fluorescence lifetime data was collected for a series of 20 crude petroleum oils using a 405 nm excitation source and over a spectral range of similar to 426 to similar to 650 nm. Average fluorescence lifetimes were calculated using three different models: discrete multi-exponential, Gaussian distribution, and Lorentzian distribution. Fitting the data to extract accurate average lifetimes using the various models proved easier and less time consuming for the FD data than with Time Correlated Single Photon Counting (TCSPC) methods however the analysis of confidence intervals to the computed average lifetimes proved cumbersome for both methods. The uncertainty in the average lifetime was generally larger for the discrete lifetime multi-exponential model when compared to the distribution-based models. For the lifetime distributions, the data from the light crude oils with long lifetimes generally fit to a single decay term. Heavier oils with shorter lifetimes required multiple decay terms. The actual value for the average lifetime is more dependant on the specific fitting model employed than the data acquisition method used. Correlations between average fluorescence lifetimes and physical and chemical parameters of the crude oils were made with a view to developing a quantitative model for predicting the gross chemical composition of crude oils. It was found that there was no significant benefit gained by using FD over TCSPC other than more rapid data analysis in the FD case. For the FD data the Gaussian distribution model for fluorescence lifetime gave the best correlations with chemical composition allowing a qualitative correlation to some bulk oil parameters.en_IE
dc.publisherSpringer Verlagen_IE
dc.relation.ispartofJournal Of Fluorescenceen
dc.rightsAttribution-NonCommercial-NoDerivs 3.0 Ireland
dc.subjectCrude oilen_IE
dc.subjectFluorescence lifetimeen_IE
dc.subjectFrequency domainen_IE
dc.subjectPhase modulationen_IE
dc.titleFrequency domain fluorescence lifetime study of crude petroleum oilsen_IE
dc.local.contactAlan Ryder, School Of Chemistry, Room 213, Arts/Science Building, Nui Galway. 2943 Email:

Files in this item


This item appears in the following Collection(s)

Show simple item record

Attribution-NonCommercial-NoDerivs 3.0 Ireland
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivs 3.0 Ireland