Mercury ion measurement in an inductively coupled discharge lamp

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:163173

Michael, J D ^[1]

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1. GE Lighting, Cleveland, OH (United States)

Laser Induced Fluorescence technique is used to detect the presence of Hg{sup +} in a 2.5 MHz Hg-Kr (0.5 Torr) Inductively Coupled Discharge. The discharge is created within a cylindrical quartz container with a coaxial inner wall. RF power is transferred to the discharge via a Ferrite core ({micro} = 14) centrally located within the inner tube. The discharge power is fixed at 20 W. The pump laser beam is directed axially through the discharge and the LIF signal detected perpendicular to the pump beam. The detected LIF at 281.5 nm is generated by a two photon process with the pump beam at 563.0 nm. The pump beam is generated by a Tunable Dye Laser (PDL-2) which is pumped by a Nd:YAG Laser (Spectra Physics GCR-150). The Hg{sup +} ions are essentially pumped from the ground state to the nearest excited state which is the 5d{sup 9}6s{sup 2} {sup 2}D{sub 5/2} level which has a radiative lifetime of 86 ms. Due to neutrality conditions in the plasma, the Hg{sup +} ion density are thus a measure of the electron density as well.

• OSTI ID: 163173
• Report Number(s): CONF-950612--; ISBN 0-7803-2669-5
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
CATIONS
ELECTRON DENSITY
FLUORESCENCE SPECTROSCOPY
FLUORESCENT LAMPS
ION DENSITY
LASER SPECTROSCOPY
PLASMA DIAGNOSTICS