OSA's Digital Library

Applied Spectroscopy

Applied Spectroscopy

| PUBLISHED BY SAS — AVAILABLE FROM SAS AND OSA

  • Vol. 54, Iss. 2 — Feb. 1, 2000
  • pp: 262–267

Near-Infrared Turbidity of β-FeOOH Particle Suspensions

P. Berdahl, L. H. Espinoza, D. Littlejohn, D. Lucas, and D. L. Perry

Applied Spectroscopy, Vol. 54, Issue 2, pp. 262-267 (2000)


View Full Text Article

Acrobat PDF (438 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations
  • Export Citation/Save Click for help

Abstract

Near-infrared transmission spectroscopy can be complicated by the light scattering from heterogeneous materials. For the examination of an evolving system exhibiting such light scattering, transmission spectra near wavenumber υ = 104 cm-1 were obtained during the hydrolysis of FeCl3 solutions. At first, the resulting turbid suspension of cigar-shaped β-FeOOH particles exhibits single-particle scattering, including a Rayleigh regime (attenuation ∝ υ4). At later times, the scattering increases strongly as the particles aggregate, and becomes proportional to υα, with α ≈ 2, consistent with scattering models that interpret the structure of aggregates in terms of a fractal dimension df roughly equal to 2. In all cases investigated, the attenuation due to scattering is spectrally smooth and increases monotonically with wavenumber. It can be written in the simple form υα with 1≤ α ≤ 4. While over limited spectral ranges α may be taken independent of υ , over wide ranges it decreases with increasing υ. This behavior is consistent with the theoretical limits of α = 4 at υ = 0, and α = 0 at υ = ∞. Overall, the results suggest that a useful form for simulating scattering backgrounds in near-infrared spectroscopy is α, with A and α fitted constants.

Citation
P. Berdahl, L. H. Espinoza, D. Littlejohn, D. Lucas, and D. L. Perry, "Near-Infrared Turbidity of β-FeOOH Particle Suspensions," Appl. Spectrosc. 54, 262-267 (2000)
http://www.opticsinfobase.org/as/abstract.cfm?URI=as-54-2-262

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited