Set4 - Question Set 4. GSW Program, Chemistry 101, Fall...

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Question Set 4. GSW Program, Chemistry 101, Fall 2005 1. Suppose that I had a molecule described as being made from two molecular pieces with a symbolic code A D, where D has partial negative charge and A has partial positive charge. Draw a sketch of how the solvent (water) molecules will orient around the A D species in this State 1. Now suppose that in a very short time (much too short for the water molecules to move at all), I used a laser to excite the A D molecule to its electronically excited state. In this state, the A end is now partially negative, and the D end is partially positive. Draw a sketch showing the orientation of the water molecules immediately after the excitation. State 2. Now suppose I wait a time (of order a few picoseconds), after which the water molecules can move to get to the potential energy minimum expected for a lower energy configuration. State 3. How does this sketch differ from the previous two? Finally discuss the relative energies of the three states. Since total energies are conserved, what do you suppose happened to the energy in changing from State 2 to State 3 ? Also, how would you estimate the time for kinetic energy to move 15 Å in water solvent?
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Set4 - Question Set 4. GSW Program, Chemistry 101, Fall...

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