Abstract

We have both theoretically and experimentally demonstrated that the laser-enhanced ionization (LEI) technique can be a simple, alternative method for flame temperature determination in an atmospheric air/acetylene flame. A three-level model of rate equations is developed to determine a flame temperature based upon the Boltzmann population of the ground fine structures of the analyte selected. A Ga sample was used for the test, and the LEI signal was measured with excitation to various intermediate states. The determined flame temperatures are very consistent with each other and also with those previously reported.

Flame temperature measurements by radar resonance-enhanced multiphoton ionization of molecular oxygen

Yue Wu, Jordan Sawyer, Zhili Zhang, and Steven F. Adams
Appl. Opt. 51(28) 6864-6869 (2012)

Laser-enhanced flame ionization detector

Terrill A. Cool and John E. M. Goldsmith
Appl. Opt. 26(17) 3542-3551 (1987)

Detection of trace amounts of Cr by two laser-based spectroscopic techniques: laser-enhanced ionization in flames and laser-induced fluorescence in graphite furnace

Ove Axner and Halina Rubinsztein-Dunlop
Appl. Opt. 32(6) 867-884 (1993)

Detection of traces in semiconductor materials by two-color laser-enhanced ionization spectroscopy in flames

Ove Axner, Mats Lejon, Ingemar Magnusson, Halina Rubinsztein-Dunlop, and Sten Sjöström
Appl. Opt. 26(17) 3521-3525 (1987)

The Application of Separated Flames in Analytical Flame Spectroscopy

G. F. Kirkbright and T. S. West
Appl. Opt. 7(7) 1305-1311 (1968)