Computerized kinetic luminescence spectrometry. Time-resolved and component-resolved phosphorence spectrometry

Multicomponent mixture analysis by multidimensional phosphorimetry

“…Barnett et al (11,12) have studied both theoretically and experimentally the various parameters associated with selecting acceptable analyte/internal standard element pairs. Watters and Norris (13) have discussed the instrumental factors which contribute to random error in emission measurements and have noted some of the advantages of internal standardization.…”

“…The correct choice of internal standards has received considerable attention. Barnett et al (11,12) proposed guidelines for choosing internal standards based on consideration of the ionization energy, excitation energy, and partition function of the elements. Recently, Myers and Tracy (18) have shown that by the proper choice of ICP operating parameters a single internal standard element improved the analytical performance independently of whether an ion or neutral atom line was chosen for the analyte.…”

Monitoring the Formation and Decay of Transient Photosensitized Intermediates Using Pump-Probe UV Resonance Raman Spectroscopy. II: Kinetic Modeling and Multidimensional Least-Squares Analysis

“…Assuming an explicit mathematical m odel for the reaction kinetics can be constructed for C, a least-squares estimate of the pure-component spectra matrix, Â , can be determined: 6,7 Â 5 DC T (CC T ) 2 1…”

“…Nonlinear least-squares, in which values of kinetic param eters are varied in order to minimize the global error surface of the t, is a valuable tool in the resolution of overlapping spectra in a kinetic process. 6,7 This multidim ension al least-sq uares analy sis app roach has been adapted [8][9][10] to the resolution of transient Raman spectra of excited triplet-state photoreactions, in which Raman scattering was accumulated from a series of single laser pulses, which simultaneously photoexcited the sample and probed the reactions between triplet states and quenchers that occured during the nanosecond laser pulse. The kinetic variables that could be controlled in a single-pulse experiment included laser intensity and quencher concentration, which govern the relative population of excited-states and the yield of the quenching reaction, respectively.…”

Στοιχειακές Και Ισοτοπικές Αναλύσεις Ουρανίου Σε Υγρά Δείγματα

“…Με την διάδοση της χρήσης ηλεκτρονικών υπολογιστών, η συλλογή δεδοµένων κατέστη δυνατόν να µεγαλώσει σε όγκο, όπου µια αντιπροσωπευτική µέση καµπύλη εξασθένησης φωσφορισµού µπορούσε να εξαχθεί από µεγάλο πλήθος µετρήσεων, και τα δεδοµένα µπορούσαν να αναλυθούν ποικιλοτρόπως, επιτρέποντας ακόµα και την ταυτόχρονη ανάλυση περισσότερων της µιας ουσιών σε ένα δείγµα [37].…”