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By Tolman R. C.

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B) What voltage needs to be applied to the electron gun for the diffraction experiment? (c) Answer part (a) if neutrons were used instead of electrons. (d) If the diffraction experiment were carried out with photons, then what wavelength, energy, and momentum would be required? 5. 21 x 1013 (b) Name the spectral region associated with each of the last four columns of the table. 6. There are two limiting cases associated with the Planck function (a) Calculate kT at room temperature (20°C) in J, kJ/mole, eV, and cm"1.

4: The CH4 molecule has an 84 axis that coincides with a C% axis but does not have a C* axis. The C^ operator is not a symmetry operator, but 64 = d^C^ is one. 5), then the inversion operation changes the signs of the coordinates of an atom, that is, The 52 = &hC<2 — Ci&h operation is equivalent to inversion because where the 2-axis coincides with the C-2 axis. The inversion operator is also its own 2. 5: The ethylene molecule has a center of symmetry. Note that i = ahC^. inverse since Symmetry Operator Algebra Symmetry operators can be applied successively to a molecule to produce new operators.

18: A normalized Lorentzian function. in terms of the full width at half maximum. Note that some authors use the half width at half maximum as a parameter rather than the full width. A£ > ft, or or The spontaneous lifetime of the excited state means that the atom or molecule cannot be found at E\ for more than rsp on average. 19). D-lines) at 5 890 A. 79b). 19: The spontaneous lifetime rsp gives the transition E\ —> EQ a finite linewidth. energy level E\ cannot be measured relative to EQ with an accuracy that is greater than Az/i/2 Hz.

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