Consider the character table given below for the point group D3h, which includes molecules like cyclopropane and BF3. Suppose has been already determined a reducible representation for the collective motions of one such molecule, Γ(3N). What combination of irreps should we remove from it to account for translations & rotations, thereby yielding the purely vibrational representation, Γvib?

Introductory Chemistry: A Foundation
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Problem 104AP: Convert 45 mi/h to m/s, showing how the units cancel appropriately.
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Consider the character table given below for the point group D3h, which includes molecules like cyclopropane and BF3. Suppose has been already determined a reducible representation for the collective motions of one such molecule, Γ(3N). What combination of irreps should we remove from it to account for translations & rotations, thereby yielding the purely vibrational representation, Γvib?

 

E' O A
D3h E 2C3 3C, ơn 2S3 30y
h = 12
A,
1
1
1
1
1
1
x² + y²,z?
A O E"
A
1
1
-1
1
1
-1
R2
2A, O E' O E"
E'
2
-1
2
-1
(х, у)
(ху, х2 — у?)
-
1
1
1
-1
-1
-1
A, O E' Ð A Ð E"
1
1
-1
-1
-1
1
A, O 2E' O A O 2E"
0 (Rx, Ry)
(xz, yz)
E"
2
-1
0 -2
1
Transcribed Image Text:E' O A D3h E 2C3 3C, ơn 2S3 30y h = 12 A, 1 1 1 1 1 1 x² + y²,z? A O E" A 1 1 -1 1 1 -1 R2 2A, O E' O E" E' 2 -1 2 -1 (х, у) (ху, х2 — у?) - 1 1 1 -1 -1 -1 A, O E' Ð A Ð E" 1 1 -1 -1 -1 1 A, O 2E' O A O 2E" 0 (Rx, Ry) (xz, yz) E" 2 -1 0 -2 1
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