Research Article
Vibrational Spectrum of HMX at CO2 Laser Wavelengths: A Combined DRIFT and LPAS Study
Table 1
HMX observed active modes and proposed assignment (vvw: very very weak, vw: very weak, w: weak, m: medium, s: strong, vs: very strong, br: broad, st: stretch, b: bend, t: torsion, def: deformation, sc: scissors, r: rock).
| | Observed frequencies (cm−1) | Assignment |
| | 5972 vvw | 2 × st CH | | 5263 vvw | 2 × st CH | | 4411 vw | CH st, st NNO2 | | 4370 vw | CH st, st NNO2 | | 4169 vvw | CH st, st NNO2 | | 3057 m | st CH | | 3030 mw | st CH | | 2987 mw | st CH | | 2924 mw | st CH | | 2857 w | | | 2806 w, br | | | 1569 vs | st NO2 | | 1449 ms | | | 1439 m | sc CH2 | | 1421 m | sc CH2 | | 1392 s | wag CH2 | | 1386 m | st NNO2 | | 1372 m | st NNO2 | | 1319 s | st NNO2 | | 1275 vs | r NNO2, b CH2 | | 1248 vs | st NCN | | 1225 s | st NCN | | 1210 s | st NCN | | 1110 w | | | 1091 w | | | 1015 m | t CH2, r NNO2 | | 913 vs | t CH2 | | 877 w | Ring breathing | | 863 mw | st NCN | | 845 m | | | 764 m | st NCN | | 752 mw | | | 734 m | | | 711 m | | | 649 w | Ring def | | 620 m | | | 603 m | | | 485 w | Ring def |
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