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Influence of Saturation Phenomena on Laser-Excited Atomic Fluorescence Flame Spectrometry

Zeitschrift für Naturforschung A ◽

10.1515/zna-1973-0220 ◽

1973 ◽

Vol 28 (2) ◽

pp. 273-279

Author(s):

J. Kühl ◽

S. Neumann ◽

M. Kriese

Keyword(s):

Power Density ◽

Laser Power ◽

Atomic Emission ◽

Equation Model ◽

Laser Power Density ◽

Atomic Level ◽

Dye Laser ◽

Atomic Fluorescence ◽

Emission Flame ◽

Flame Spectrometry

Using a simple rate equation model, the laser power density Ic necessary to reach 50% of the saturation limited population of the excited atomic level under typical flame conditions is calculated. For Na atoms aspirated into the flame a saturating power density for irradiation with a narrow dye laser line (bandwidth 0.033 Å) of Ic ~ 0.4 kW/cm2 was determined. With the aid of a dye laser with an appropriate laser power density, analytical curves for Na were measured yielding a detection limit of 0.2 ng/ml. This sensitivity is comparable with the best results obtained by atomic emission flame spectrometry.

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Some causes of bending of analytical curves in atomic emission flame spectrometry

Analytica Chimica Acta ◽

10.1016/0003-2670(66)80005-3 ◽

1966 ◽

Vol 36 ◽

pp. 42-56 ◽

Cited By ~ 16

Author(s):

T.J. Vickers ◽

L.D. Remington ◽

J.D. Winefordner

Keyword(s):

Atomic Emission ◽

Emission Flame ◽

Flame Spectrometry

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A New Optical System for Flame Spectroscopy with Special Reference to Thermally Assisted Anti-Stokes Fluorescence Applications

Applied Spectroscopy ◽

10.1366/000370271774370985 ◽

1971 ◽

Vol 25 (1) ◽

pp. 57-60 ◽

Cited By ~ 12

Author(s):

P. Benetti ◽

N. Omenetto ◽

G. Rossi

Keyword(s):

Detection Limits ◽

Total Consumption ◽

Atomic Fluorescence ◽

Flame Emission ◽

Analytical Importance ◽

Primary Focus ◽

Spherical Mirrors ◽

Anti Stokes ◽

Flame Spectrometry ◽

Flame Position

A new optical setup for increasing the intensity of atomic fluorescence flame spectrometry is presented. The arrangement consists of two concave spherical mirrors and an elliposidal mirror whose primary focus is located at the flame position, and secondary at the entrance slit of the monochromator. Approximately 10 times gain in the measured intensities was obtained. The system is also useful for flame emission work, for which about five times gain was observed. With a low background flame such as the air–H2 for the N2−H2 diffusion flame and 400 µ slits, calcium can be detected at the level of 0.005 µg/ml. Moreover, the observed thermally assisted anti-Stokes fluorescence of In and Ga can be of analytical importance since the detection limits with a total consumption burner and the air-H2 flame were found to be 0.015 and 0.02 µg/ml, respectively. Detection limits in atomic fluorescence for Cr, Tl, In, and Fe are also presented.

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