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Vibrational subsystem analysis and BNM results for butane at the highest transition state (i.e., eclipsed conformation). All frequencies are listed in cm−1.
| VSA Freq. | Full NMA Freq. (% overlap) | BNM Freq. | Full NMA Freq. (% overlap) |
|---|---|---|---|
| −165 | −175 (99) | −154 | −175 (98) |
| 314 | 310 (100) | 320 | 310 (99) |
| 516 | 501 (99) | 540 | 304 (82) |
| 684 (50) | |||
| 870 | 814 (92) | 569 | 501 (97) |
| 1093 | 968 (64) | 703 | 286 (69) |
| 1074 (65) | 1160 (40) | ||
| 1182 | 1018 (42) | 946 | 814 (81) |
| 1110 (70) | 1111 (54) |
