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Microsecond-pulse glow discharge atomic emission.

W O Walden¹, W Hang, B W Smith

¹Department of Chemistry, University of Florida, 32611, Gainesville, FL, USA.

Analytical and Bioanalytical Chemistry

|June 1, 1996

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This study generated a microsecond pulsed glow discharge, achieving significantly higher emission intensity than conventional direct current (DC) methods. This indicates a more intense plasma generation during the pulsed "on" phase without sample overheating.

Area of Science:

Plasma physics
Atomic spectroscopy

Background:

Glow discharges are widely used in various analytical techniques.
Conventional direct current (DC) glow discharges can lead to sample overheating and limited plasma intensity.

Purpose of the Study:

To investigate the potential of microsecond pulsed glow discharge for enhanced plasma generation.
To study atomization, excitation, and ionization processes in pulsed glow discharge using time-resolved spectroscopy.

Main Methods:

Generation of a microsecond pulsed glow discharge with high pulse magnitude and low duty cycle.
Application of time-resolved emission and absorption spectroscopy to analyze plasma characteristics.
Comparison of pulsed mode with conventional DC glow discharge.

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Main Results:

Achieved emission peak intensity several orders of magnitude greater than DC mode.
Demonstrated intense plasma generation during the pulsed "on" phase.
Avoided sample overheating, a common issue with DC discharges.

Conclusions:

Microsecond pulsed glow discharge offers a superior alternative to DC mode for generating intense plasmas.
This technique enhances analytical capabilities by providing higher signal intensity without compromising sample integrity.