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HW B4 - 1 Which one is incorrect about the electrons in...

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1. Which one is incorrect about the electrons in atom? Its "degenerate pressure" is caused by Pauli's exclusion principle. Triplet is more stable than singlet because its spatial part is anti-symmetric. Its L·S coupling is caused by relativistic effect. Without L·S coupling, we can measure its total orbit angular momentum vector exactly. With L·S coupling, we should build up a new quantum number to use it as a good quantum number. 2. Which state generates the exactly same terms as d 3 state? d 1 d 4 d 6 d 7 d 9 3. Which one is incorrect about the H 2 + MO with as a truncated LCAO? Because we use only two atomic orbital, we can get only two energy states. By using SALC AO, we can assign easily. Because we use two spherically symmetric atomic orbital, its MO is also spherically symmetric. It can be used as a basis when we construct diatomic molecular orbitals. A node is occurred by destructive interference between two atomic orbitals. 4. Which one is incorrect about the vibronic transition in molecules? It is controlled by Franck-Condon Rule which is related to overlap integral between two different states. A molecule which has Stoke's shift shows red-shifted emission spectrum. The reason why phosphorescence has long lifetime is that it is related to forbidden transition. Intersystem crossing is much faster than internal conversion. Fluorescence occurred only between two states which are not crossed with each other. 5. Which term symbol cannot be generated by p 2 states? 1 S 0 1 D 0 1 P 0 3 P 2 3 P 0 6. . Ms S=0 A . S=1 B W . A, B _ } - ? (1)Singlet, Triplet (2)Singlet, Doublet (3)Triplet, Singlet (4)Doublet, Singlet
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7. = o 6 B . (1)Term symbol = = B . (2)Hund's rule t b = . = β M. (3)Total angular momentum I <L,S> g . (4)None of above 8.Doffler effect d B +X P ^ E t ) b = ? (1)Red Shift T [ B . (2)Blue Shift [ B . (3) g . (4)7 α B . 9. Beer's law . It/I0 = } B - (It/I0=??) (1)Log function (2)Exponential function (3)Linear function (4)Delta function (5)None of above 10. GOT = W B ? (1)4 7 B g orthogonal . (2)4 7 5 . (3)4 g orthogonal I . (4)None of above 11. which statement is not assumption of Hückel model? (1) The Coulomb and resonance integrals are same for all conjugated hydrocarbons (2) (3)
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(4) (5) 12. which is right designate of next MO? (1) sigma bond, bonding (2) pi bond, antibonding (3) pi bond, nonbonding (4) sigma bond, antibonding (5) pi bond, bonding 13. which molecule have the biggest bond order? (1) (2) (3) (4) (5) 14. which is the wrong J value of below term symbol? (1) 4 S -> J = 3/2 (2) 4 F -> J = 9/2 (3) 3 P -> J = 3 (4) 2 D -> J = 5/2 (5) 1 D -> J = 2 15. which of the following transitions shows multiple spectral peaks due to a splitting of terms? (1) 1 S -> 1 P (2) 2 P -> 2 S (3) 3 S -> 3 P (4) 3 P -> 3 D
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(5) 1 S -> 2 D 16. good quantum number B ? L S J I term symbol ] - 17. L W ?
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