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

Authors: Russo, R.E.¹; Hieftje, G.M.¹

Source: Applied Spectroscopy, Volume 36, Issue 2, Pages 87-189 (March/April 1982) , pp. 92-99(8)

Publisher: Society for Applied Spectroscopy

Key:

- Free Content

- New Content

- Subscribed Content

- Free Trial Content

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

Document Type: Research article

Affiliations: 1: Department of Chemistry, Indiana University, Bloomington, Indiana 47405

The full text electronic article is available for purchase. You will be able to download the full text electronic article after payment.

$20.00 plus tax