An analytical technique for aerosol samples which utilizes the resonance Raman effect is described. The aerosol particles were generated at 50 kHz by a vibrating orifice. The nominal particle size was 45 μm in diameter. The visible lines (4579, 4765, 4880, and 5145 Å) of a continuous argon-ion laser were used as the excitation source. Within the coverage of the laser wavelengths, effects of pre-resonance, resonance, and post-resonance Raman scattering were studied. Under the resonance condition, the enhancement of <i>p</i>-nitrosodimethylaniline is 5.5 × 10<sup>4</sup> when compared to that of nitrate ions. The corresponding concentration of detection limit is 10<sup>−6</sup> molar.

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