Optogalvanic effect in a hollow cathode discharge with nonlaser sources

Area of Science:

• Atomic Spectroscopy
• Analytical Chemistry
• Plasma Physics

Background:

• Optogalvanic spectroscopy in hollow cathode lamps is a sensitive analytical technique.
• Identifying suitable atomic emission sources is crucial for enhancing signal generation.

Purpose of the Study:

• To evaluate various atomic emission sources for their efficacy in inducing optogalvanic signals in hollow cathode lamps.
• To determine the most effective excitation methods for optogalvanic detection.

Main Methods:

• Investigated several atomic emission sources: inductively coupled argon plasma, H(2)-O(2) flame, high-temperature furnace, electrodeless microwave discharge lamps, and hollow cathode lamps.
• Focused emission from sources into hollow cathode tubes.
• Monitored optogalvanic signal generation.

Main Results:

• Successful optogalvanic signals were achieved using argon emission from an inductively coupled plasma and atomic emission from a matching hollow cathode discharge.
• Other investigated sources yielded very low-level signals, difficult to attribute to specific elements.
• Photoelectric emission and cathode radiative heating contributed to background signals.

Conclusions:

• Inductively coupled plasma and hollow cathode discharges are promising sources for inducing optogalvanic signals in hollow cathode lamps.
• Further research is needed to optimize signal-to-noise ratio and mitigate background interference from other sources.