Hollow Cathode Lamps
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Atomic Absorption Determination of Zinc and Copper in a ...
terrificscience.orgHollow cathode lamps are used as the source on an atomic absorption spectrophotometer. The lamp has a cylindrical metal cathode sealed in a glass tube containing argon or neon. When a voltage is applied, the metal atoms of the cathode become electrically excited and then emit photons of light when they return to the ground state.
Basic Principles of Atomic Absorption and Atomic Emission ...
www.philadelphia.edu.jo• Hollow cathode lamps normally operate at currents of 3-15 mA. • If the applied power is raised to several hundred mA, they exhibit a phenomenon called self-reversal. • This giant pulse of current changes the nature of the analyte absorption line so it will only measure the background absorbance. • A total
Spectroscopy in the UV and Visible: Instrumentation
blamp.sites.truman.edu• Hollow Cathode Lamp – Cathode is coated with atom of interest – Tube is filled with Ar or Ne – High voltage ionizes gas, charged ions are accelerated toward electrodes • Produces sputtering of atoms (ground and excited) • Excited atoms emit light at atomic lines – Design of HCL results in redepostion of metal atoms onto