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Raman tensors of selected bands of the tryptophan side chain
| Band (cm−1) | Mode | r1(≡αxx/αzz) | r2(≡αyy/αzz) | Principal axes |
|---|---|---|---|---|
| 1368 | W7″ | 1.56 | 6.13 | y: intersects Cɛ3 and Cδ1 |
| x: ⊥ to y and intersects Cζ2 | ||||
| z: ⊥ to y and x | ||||
| 1548 | W3 | 0.59 | 2.71 | y: intersects Cζ3 and Cδ2 |
| x: ⊥ to x and intersects Cζ2 | ||||
| z: ⊥ to y and x |
Determined from polarized Raman analysis of a single crystal of N-acetyl-l-tryptophan (Tsuboi et al., 1996b).
