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Cell[CellGroupData[{
Cell["Problem 8.13 (Engel)", "Title"],

Cell["\<\
Decide which normal modes of CO2 and H2O have nonzero dynamic dipole moments \
(and are IR active).\
\>", "Text"],

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Cell["Solution", "Subtitle"],

Cell[TextData[{
  "Strategy.\n",
  StyleBox["Each formula shows a molecule combined with 2 or 3 arrows. To \
visualize the motion, 1) imagine each atom moving in the direction of its \
corresponding arrow, 2) imagine atoms without arrows as stationary. Of \
course, since these are oscillatory motions, the atoms would collectively ",
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  StyleBox[" their motions at some point, but this should not change your \
assessment.",
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  "Execution.\n",
  StyleBox["I discussed these motions with you in class. As a first \
approximation, you should assume the motions do not change partial charges on \
atoms. Rather, the motions change the location of each partially charged \
atom.\n\nGiven this, the only motion that fails to change the molecule's \
dipole moment is the ",
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  StyleBox["symmetric stretch",
    FontWeight->"Plain",
    FontVariations->{"Underline"->True}],
  StyleBox[" in CO2. This normal mode should be IR inactive.\n\nAll of the \
other motions lead to changes in dipole moment and are IR active.",
    FontWeight->"Plain"]
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Cell[1995, 64, 1265, 29, 428, "Text"]
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