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Determination of Atomic and Molecular Excited-state Lifetimes Using an Optoelectronic Cross-correlation Method

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Abstract:

A new optoelectronic cross-correlation technique has been used to measure excited-state lifetimes of several organic fluorophores in solution and of sodium atoms in both air-acetylene and methane-air flames. Capable of time resolution in the picosecond range, the new method was validated by the excellent agreement between measured and literature values for fluorescence lifetimes of the organic species. Lifetime values for Na atoms in flames are among the most precise ever reported and agree closely with values calculated from the known flame gas composition, temperature, and the quenching cross-sections of the two dominant quenching species in the flame, N2 and CO2. From the Na excited-state lifetimes (0.72 ± 0.07 ns for air-acetylene and 0.48 ± 0.08 ns for methane-air flames), quantum efficiencies for atomic fluorescence were calculated.

Keywords: Emission spectroscopy; Flame atomic fluorescence spectroscopy; Flame spectroscopy; Fluorescence; Instrumentation, time-resolved fluorescence; Lasers, synchronously pumped dye laser; Luminescence; Time-resolved spectroscopy

Document Type: Research Article

DOI: http://dx.doi.org/10.1366/0003702824638791

Affiliations: Department of Chemistry, Indiana University, Bloomington, Indiana 47405

Publication date: March 1, 1982

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