Atomic_Spectroscopy_Problem_Set_Solutions

Atomic_Spectroscopy_Problem_Set_Solutions - WDM l i~-~© Mm...

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Answer the following questions regarding hollow cathode lamps. a) What kind of source is a hollow-cathode lamp. b) Draw a hollow-cathode lamp and label all the components that make up a hollow-cathode lamp. c) Explain how a hollow-cathode lamp works. d) Why do we use hollow-cathode lamps in atomic absorption spectroscopy? e) What is the major disadvantage of a hollow—cathode lamp? 5. In which technique, atomic absorption or atomic emission, is flame temperature stability more critical? Why? 6. What are the advantages and disadvantages of the inductively coupled plasma compared with conventional flames in atomic spectroscopy? 7. The 1St excited state of Ca is reached by absorption of 422.7 nm light. a) What is the energy difference (AB) in KJ/mol between the ground and excited > states? b) The relative degeneracies are g"‘/g0 = 3 for Ca. What is the ratio N"‘/No at 2500 K. c) By what percentage will the fraction you calculated in part b be changed by a 15 K rise in temperature. d) What will be the ratio N"‘/No at 6000 K. 8. Name 3 background correction techniques that can be used in atomic spectroscopy. ...
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This note was uploaded on 11/03/2009 for the course CHEM 241 taught by Professor Tiani during the Summer '08 term at UNC.

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Atomic_Spectroscopy_Problem_Set_Solutions - WDM l i~-~© Mm...

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