2. Why are electrothermal atomizers generally \"better\" for atomic absorption?

ID: 634021 • Letter: 2

Question

2. Why are electrothermal atomizers generally "better" for atomic absorption?

3. Why are fluorescence measurements made at 90 degrees from the incident beam in most cases?

4. What is the ideal cuvette placement to avoid pre- and post-filter effects?

5. What can you do if your intended analyte does not fluoresce (give two options)?

6. Consider the symmetric stretching of carbon tetrachloride (CCl4). Explain why this stretch is not IR active, but is Raman active.

7. Why is it generally better to measure Raman scattering at longer wavelengths, even though Raman signal drops as wavelength

increases (1/?4 dependence)?

8. Why are notch filters used in Raman spectroscopy?

9. Consider a Raman band with a Raman shift of 460 cm-1. If the laser is switched from afrequency-doubled Nd:YAG (532 nm) to

a HeNe laser (633 nm), What will the Raman shift (cm-1) of the same Raman band be?

10. What is the main drawback of Surface-enhanced Raman scattering (SERS)?

11. What causes poor signal-to-noise at low absorbance? At high absorbance?

the note has all the answers for these questions.

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