A study of aerosol chemical reactions by optical resonance spectroscopy

Taflin, Daniel C.; Davis, E. James

doi:10.1016/0021-8502(90)90024-r

Cited by 27 publications

(8 citation statements)

References 22 publications

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“…3 Perhaps the most familiar method of high-precision sizing of levitated microdroplets involves measurement and identification of resonance features in an elastic or inelastic scattering spectrum in the size parameter domain ͑Xϭd/; d is the diameter and is the excitation wavelength͒. [6][7][8] From the standpoint of quantitative fluorescence or Raman measurements on levitated microparticles, or in electrodynamically guided microdroplet streams, 9 it is desirable to have a particle sizing capability of comparable precision that operates on a measurement time scale of several milliseconds as well as being independent of location and assignment of a particular droplet resonance. 5 While resonance-based light scattering techniques have the advantage of very high precision ͑Ϸ1 part in 10 5 ͒, measurement time scales are typically of the order of several seconds.…”

Section: Introductionmentioning

confidence: 99%

A CCD based approach to high-precision size and refractive index determination of levitated microdroplets using Fraunhofer diffraction

Barnes

Lermer

Whitten

et al. 1997

Review of Scientific Instruments

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Section: Introductionmentioning

confidence: 99%

A CCD based approach to high-precision size and refractive index determination of levitated microdroplets using Fraunhofer diffraction

Barnes

Lermer

Whitten

et al. 1997

Review of Scientific Instruments

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“…They showed that a change in charge of several orders of magnitude had no effect on the optical or physical properties of the suspended particle. Taflin and Davis (1990) also demonstrated that charge has no effect on chemical reactions that occur on a suspended particle. Fourier transform infrared spectroscopy has also been performed on single particles (Grader and Arnold, 1987) and the spectra of the particles were shown to be the same as the bulk solution.…”

Section: Experimental Single Particle Balance Backgroundmentioning

confidence: 99%

Measurements of the Ultraviolet Fluorescence Cross Sections and Spectra of Bacillus Anthracis Simulants

Stephens¹

1998

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Measurements of the ultraviolet autofluorescence spectra and absolute cross sections of the Bacillus anthracis (13a)simulants Bacillus globigii @g), Bacillus megaterium @m), Bacillus subtilis (Bs), and Bacillus cereus @c) were measured. Fluorescence spectra and cross sections of pine pollen (Pina echinata) were measured for comparison. Both dried vegetative cells and spores separated from the sporulated vegetative material were studied. The spectra were obtained by suspending a small number (< 10) of particles in air in our Single Particle Spectroscopy Apparatus (SPSA), illuminating the particles with light from a spectrally faltered arc lamp, and measuring the fluorescence spectra of the particles. The illumination was 280 nm (20 nm FWHM) and the fluorescence spectra was measured between 300 and 450 nm. The fluorescence cross section of vegetative Bg peaks at 320 nrn with a maximum cross section of 5 X 10"4 cm2/sr-nm-article while the Bg spore fluorescence peaks at310 nrn with peak fluorescence -1', 2 of 8 X 10 cm /sr-nrn-particle. Pine pollen particles showed a higher fluorescence peaking at 355 nm with a cross section of 1.7 X 10-'3cm2/sr-nm-particle. Integrated cross sections ranged from 3.0 X 10-'3for the Bg spores through 2.25 X 10-12(cm2/sr-particle) for the vegetative cells.

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“…Finally, new developments pertaining to the measurement of droplet temperature in aerosols and sprays are described. [4]. Durch Auswertung der Strukturresonanzen kann der Brechungsindex sehr genau bestimmt werden [5,6].…”

Section: Introductionunclassified

Optische Konzentrations‐ und Temperatur‐Messung in Aerosolen und Sprays

Schweiger¹

1992

Chemie Ingenieur Technik

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Optical measurement of concentration and temperature in aerosols and sprays. This article surveyes progress in the development and application of optical methods, particullarly in Raman scattering and fluorescence for the analysis of aerosols and sprays. The main emphasis lies on examination of the particle phase. Fundamentals and state of the art in the determination of molecular composition of the particle phase with the aid of linear and simulated Raman scattering are described and the role of structural resonance discussed. Various models are presented for distinguishing between the contribution of the liquid and the gas phase to Raman scattering and fluorescence. Finally, new developments pertaining to the measurement of droplet temperature in aerosols and sprays are described.

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A study of aerosol chemical reactions by optical resonance spectroscopy

Cited by 27 publications

References 22 publications

A CCD based approach to high-precision size and refractive index determination of levitated microdroplets using Fraunhofer diffraction

A CCD based approach to high-precision size and refractive index determination of levitated microdroplets using Fraunhofer diffraction

Measurements of the Ultraviolet Fluorescence Cross Sections and Spectra of Bacillus Anthracis Simulants

Optische Konzentrations‐ und Temperatur‐Messung in Aerosolen und Sprays

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