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A biexponential fit of this surface 2P data is dominated by a 0.25 ns lifetime component with a smaller contribution from a 0.73 ns slower component, and is similar to the rapid 0.34 ns decay observed from 1P-TRPL.
The fast component increased to a 0.49 ns lifetime, while the longer lifetime component lengthened to 1.8 ns, which is a 2.5× increase compared to the lifetime measured near the surface of the crystal.
Lifetimes were correlated with ground-state conformers in six peptides by assigning the major lifetime component to the major NMR-determined χ1 rotamer.
1P-TRPL on the Cd-treated CdTe crystal show a slow lifetime component of 5 ns, which is a factor of >10× lower than the bulk lifetime measured using 2P-TRPL (5 ns vs. >70 ns).
The third lifetime component corresponds to the annihilation of ortho-Positronium in a very low concentration of voids with radii 2.1 2.7 Å.
No evidence for the existence of a lifetime component characteristic of the crystal nanochannels was found, indicating that the second annihilation mechanism is dominant.
Similar(25)
(b) Fast and (c) slow lifetime components of the biexponential fit of lifetime curves.
(b) Short and (c) long lifetime components of the biexponential fit.
Simulations were performed assuming a single lifetime material, and for a material with two lifetime components.
Positron lifetime spectra for all the samples give best fit for three distinct lifetime components.
Figures 6b and 6c show the fast (τf) and slow (τs) lifetime components, respectively, extracted from a biexponential fit as a function of nominal focus depth (Δz).
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