Chemical Characterization of Flowing Polydisperse Aerosols by Raman Spectroscopy

Stowers, M.A.; Friedlander, Sheldon K.

doi:10.1080/027868202753339078

Cited by 15 publications

(10 citation statements)

References 27 publications

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“…For big particles we can expect the proportionality of the Raman signal to the volume of microsphere that was reported in numerous experimental studies. 4,8,13 The scattering phase function should be in agreement with the computational results of Kerker and Druger 20 because their code describes the main features of angular distribution of the fluorescence of dye droplets. 26,27 The depolarization of Raman scatter at 90°for an incident wave with vertical polarization should be insignificant in accordance with the experimental results of Fung and Tang.…”

Section: Introductionsupporting

confidence: 63%

“…Raman and fluorescent methods are widely used in spectroscopic analysis of microparticles composition [1][2][3][4][5][6][7][8][9][10][11][12][13] and biological-aerosol identification. 14 -16 One of the properties that distinguish incoherent inelastic scattering from elastic ͑Mie͒ scattering is the phase function ͑scattered intensity versus polar an-gle͒, which is rather smooth for inelastic scattering and has no characteristic peak in the forward direction.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Angle- and size-dependent characteristics of incoherent Raman and fluorescent scattering by microspheres 2 Numerical Simulation

Veselovskii¹,

Griaznov²,

Kolgotin³

et al. 2002

Appl. Opt.

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The results of numerical simulation of inelastic scattering by microspheres with the use of a dipole model are presented. The formulas that are derived speed up the computation, thereby permitting larger-sized microspheres to be studied. The angular scattering cross section and depolarization are calculated for a wide range of size parameters as well as for different orientations of incident wave polarization. Calculations performed with small incremental changes in size permit the influence of morphology-dependent resonance (MDR) on the power and angular distribution of scattered radiation to be studied. TM and TE types of MDR produce enhanced scattering of the incident wave with vertical and horizontal polarization; the corresponding shape of the phase function becomes oscillatory. Special attention is paid to the simulation of backward scattering by water droplets, which is important for Raman lidar applications.

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Section: Introductionsupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Angle- and size-dependent characteristics of incoherent Raman and fluorescent scattering by microspheres 2 Numerical Simulation

Veselovskii¹,

Griaznov²,

Kolgotin³

et al. 2002

Appl. Opt.

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“…Experimental studies show that Raman scattering from aerosols in the respirable size range is roughly proportional to the concentration of the measured component, if the signal is averaged over a sufficient particle size range. 14,30 However, these studies were conducted on spheres or single component particles. So far, multicomponent particles of complex morphology have not been studied adequately.…”

Section: Theorymentioning

confidence: 99%

Red-Excitation Dispersive Raman Spectroscopy is a Suitable Technique for Solid-State Analysis of Respirable Pharmaceutical Powders

Vehring

2005

Appl Spectrosc

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Dispersive Raman spectroscopy with excitation by a red diode laser is suitable for quantitative crystallinity measurements in powders for pulmonary drug delivery. In spray-dried mixtures of salmon calcitonin and mannitol, all three crystalline polymorphs of mannitol and amorphous mannitol were unambiguously identified and their mass fractions were measured with a limit of quantification of about 5%. The instrument design offered high sensitivity and adequate background suppression, resulting in a low limit of detection in the range of 0.01% to 1%. This spectroscopy method has significant advantages over established techniques regarding specificity, sensitivity, and sample requirements.

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“…Early warning of the presence of chemical agent aerosols is an important component in the defense against such agents. Several Raman scattering measurements for the detection of chemical aerosols have been reported previously with detection sensitivities in the 0.04–1000‐ng/cm 3 range . The detection sensitivity is proportional to the molecular mass of the aerosol and inversely proportional to its Raman cross section.…”

Section: Introductionmentioning

confidence: 99%

Chemical aerosol detection and identification using Raman scattering

Aggarwal

Cecca

Farrar

et al. 2014

J Raman Spectroscopy

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Early warning of the presence of chemical agent aerosols is an important component in the defense against such agents. A Raman spectrometer has been constructed for the purpose of detecting and identifying chemical aerosols. We report the detection and identification of a low-concentration chemical aerosol in atmospheric air using 532-nm continuous wave laser Raman scattering. We have demonstrated the Raman scattering detection and identification of an aerosol of isovanillin of mass concentration of 1.8 ng/cm 3 with a signal-to-noise ratio of about 19 in 30 s for the 1116-cm À1 mode with a Raman cross section of 3.3 × 10 À28 cm 2 using 8-W double-pass laser power.

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Chemical Characterization of Flowing Polydisperse Aerosols by Raman Spectroscopy

Cited by 15 publications

References 27 publications

Angle- and size-dependent characteristics of incoherent Raman and fluorescent scattering by microspheres 2 Numerical Simulation

Angle- and size-dependent characteristics of incoherent Raman and fluorescent scattering by microspheres 2 Numerical Simulation

Red-Excitation Dispersive Raman Spectroscopy is a Suitable Technique for Solid-State Analysis of Respirable Pharmaceutical Powders

Chemical aerosol detection and identification using Raman scattering

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