Energy considerations in dual laser ionization processes in flames

Journal Article · Thu Dec 01 04:00:00 EST 1983 · Anal. Chem.; (United States)

DOI:https://doi.org/10.1021/ac00264a040· OSTI ID:6972623

Curran, F M; Lin, K C; Leroi, G E; Hunt, P M; Crouch, S R

Dual laser ionization (DLI) in flames is a promising technique for trace metal analysis and flame temperature estimation. In this paper, the success of DLI as a means of enhancing ionization signals arising from resonant excitation of analytes is demonstrated for Li, Na, Ca, and Sr. In addition, some DLI schemes which produce no enhancement are exhibited. The lack of enhancement is explained in terms of two factors: the decline of photionization cross sections with increasing energetic overshoot into the electronic continuum, and the competition between photoionization and collisional ionization. Considerations applicable to the optimization of DLI experiments are discussed. 2 figures, 2 tables.

• Research Organization: Michigan State Univ., East Lansing
• OSTI ID: 6972623
• Journal Information: Anal. Chem.; (United States), Journal Name: Anal. Chem.; (United States) Vol. 55:14; ISSN ANCHA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400102* -- Chemical & Spectral Procedures
400104 -- Spectral Procedures-- (-1987)
400500 -- Photochemistry
ABSORPTION SPECTROSCOPY
ALKALI METALS
ALKALINE EARTH METALS
AQUEOUS SOLUTIONS
CALCIUM
CESIUM
CHEMICAL ANALYSIS
DATA
DISPERSIONS
DYE LASERS
EFFICIENCY
ELECTROMAGNETIC RADIATION
ELEMENTS
ENERGY-LEVEL TRANSITIONS
EXCITATION
EXPERIMENTAL DATA
FLAMES
INDIUM
INFORMATION
IONIZATION
IONIZATION POTENTIAL
LASER RADIATION
LASERS
LIQUID LASERS
LITHIUM
METALS
MIXTURES
NUMERICAL DATA
PHOTOIONIZATION
POTASSIUM
QUANTITATIVE CHEMICAL ANALYSIS
RADIATIONS
SODIUM
SOLUTIONS
SPECTROSCOPY
STRONTIUM
TRACE AMOUNTS
WAVELENGTHS