Resonance-Enhanced Raman Spectroscopy on Explosives Vapor at Standoff Distances
Figure 6
UV-absorption spectra of (a) NM, (b) 2,4-DNT, and (c) 2,4,6-TNT in vapor phase, measured with a UV/visible absorption spectrometer. The dashed line in (a) is a measurement with higher NM concentration, revealing an absorption maximum at 273 nm. The absolute sample concentrations were not measured. The arrows show the wavelengths where the maximum in apparent resonant Raman cross section is found in the vapor phase measurements of each substance. The UV spectra were taken at 291 K, 353 K, and 393 K for NM, DNT, and TNT, respectively.
