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Frenkel and Schottky are intrinsic or extrinsic defects, point or linear defects.
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- If a Schottky defect concentration of 6.2 x 1010 /cm3 is observed in Al2O3, what is the total vacancy concentration (in 1/cm3) present in this sample of Al2O3? a. 2.3 x 108b. 3.1 x 1010c. 6.2 x 1010d. 1.24 x 1011e. 3.1 x 1011 When compared to that of a covalent material, the short-range atomic structure of amaterial assembled using ionic bonding can be characterized as having a:a) higher coordination numberb) lower atomic packing factorc) higher atomic packing factord) lower coordinationnumbere) a and c onlyIn a certain Patterson map for an orthorhombic crystal, space group P222, with coordinates of equivalent positions at x,y,z; x,y,-z, -x,-y,1/2+z, -x,y,1/2-z, there were high peaks at u,v,w of 0,0,0.74; 0.6,0,0; 0,0.36,0.25, assuming one heavy atom per asymmetric unit, find the coordinates of this heavy atom.How does fluorescence work in bulk semiconductors?
- !determine:(i) the point group to which thiophene (C 4 H 4 S) belongs;(ii) the number of internal degrees of freedom for thiophene;(iii) the irreducible representation for thiophene;(iv) the number of IR active C-H stretching modes for thiophene;(v) the number of Raman active C-H stretching modes for thiophene.The molecule with simple formula N2F2 has several isomers; two of these isomers have central nitrogens, with a terminal fluorine on each nitrogen. Show the Lewis Dot Diagram. For the cis isomer : What is the point group? (include formal charges, if any). Write also the main symmetry elements How many IR bands bands would you expect if vib = 3A1 + A2 +2B2? For the trans isomer : What is the point group? (include formal charges, if any). Write also the main symmetry elements How many IR bands bands would you expect if vib = 3Ag + Au +2Bu?
- Sketch the hyperfine structure of deuterium (1 = 1) for 1² S₁, 2² P₁ and 2² P3 as well as 3² D3 and 3²D5! 1' and 2² Pº3 2 2 2 2 2The chlorophylls that participate in photosynthesis and the haem (heme) groups of cytochromes are derived from the porphine dianion group (8), which belongs to the D4h point group. The ground electronic state is A1g and the lowest-lying excited state is Eu. Is a photon-induced transition allowed from the ground state to the excited state? Explain your answer.What would be the lowest possible excitation energy for benzene in this model? Give your answer in units of β.
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