Which on of the following molecules are not rotationally Raman active? a. H_2O b

Question

Which on of the following molecules are not rotationally Raman active? a. H_2O b. NH_3 c. N_2 d. CH_4 e. CO_2 13) Which pair of atoms has the largest reduced mass? a. C-D b. D-D c. C-H d. H-H e. H-F 14) Compared to^12C^16O, the first rotational transition frequency of^12C^18O will be a. the same b. higher c. lower d. zero 15) Which of the following molecules does not have an allowed infrared transition? a. CH_4 b. N_2 c. H_2O d. HBr e. NH_3 16)Halving the force constant, k, results in in the characteristic vibrational frequency a. a four-fold increase b. an increase by the squareroot of two c. a two- fold decrease d. a decrease by the squareroot of two e. no change in

Explanation / Answer

12. c N2

13. e HF

14.b higher

15. b N2

16. b an increase by the square root of two

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