E6 Optical Spectroscopy - absorb or emit light with a...

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EXPERIMENT 6 Optical Spectroscopy Write the answers to these pre-laboratory questions in your lab notebook. Answers to these questions are due at the beginning of your lab section during the week of October 17–21. Additionally, as you will be recording visible light spectra in lab, you are encouraged to bring colored pencils, markers, crayons, etc. to lab with you so that you may record your spectra in color. Pre-laboratory Questions: 1. Write the experiment title and purpose in your lab notebook. 2. Explain the difference between continuous and line spectra. 3. Explain the difference between absorption and emission spectra. 4. For an atom with the energy levels below, what wavelength light (in nm) will be emitted in a transition between E 3 and E 1 (indicated by the down arrow below)? What wavelength of light must be absorbed to cause a transition between E 4 and E 5 (indicated by the up arrow below)? E 5 = -6.0 kJ/mol E 4 = -17.0 kJ/mol E 3 = -39.5 kJ/mol E 2 = -200.0 kJ/mol E 1 = -1150.0 kJ/mol 5. Can the atom of Question 4 absorb or emit light with a wavelength of 4434 nm? Can it
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Unformatted text preview: absorb or emit light with a wavelength of 654 nm? If so, state which energy levels the transition occurs between. 6. Consider the emission spectra of the two hypothetical elements X and Z shown on the following page. (Note: On each spectrum, the upper scale corresponds to energies in units of electron volts (eV). 1 eV = 1.602 x 10-19 J = 0.1602 aJ) Emission spectrum of X: 1.7 1.8 1.9 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 eV 700 600 500 400 nm Emission spectrum of Z: 1.7 1.8 1.9 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 eV 700 600 500 400 nm Draw a picture of the emission spectra expected from a sample containing a mixture of X and Z on the spectrum blank below. Emission spectrum of a mixture of X and Z: 1.7 1.8 1.9 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 eV 700 600 500 400 nm 7. Sketch out a tentative experimental procedure. This procedure need not be overly detailed; a few sentences or outline should suffice....
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This document was uploaded on 10/26/2011 for the course CHEM 207 at Cornell University (Engineering School).

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E6 Optical Spectroscopy - absorb or emit light with a...

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