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Unformatted text preview: set of term symbols for the lowest triplet state manifold? Of course, emission from this triplet state manifold to the ground state is extremely weak. Why is that? What is the term symbol of the ground state for calcium? What are the population ratios of the levels in this manifold to the ground state at thermal equilibrium in a plasma with a temperature of 40,000 K? 4. The table below records peak area as a function of ashing, or pretreatment, temperature for an aqueous sample of Pb 2+ using the graphite-furnace AA. Temperature ( o C) neat sample w/NH 4 H 2 PO 4 matrix modifier 600 0.24 0.24 700 0.24 0.24 800 0.24 0.24 900 0.21 0.24 1000 0.15 0.21 1100 0.04 0.17 1200 0.02 0.13 What is the effect of adding the matrix modifier? How does the matrix modifier work? Provide other reasons for the use of matrix modifiers in graphite-furnace AA. 5. The Ar +-laser is a four-level system. Draw the energy level diagram for a laser of this type....
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This note was uploaded on 05/13/2008 for the course CHEM 423 taught by Professor Sykes during the Spring '08 term at Pennsylvania State University, University Park.
- Spring '08