OSA's Digital Library

Applied Spectroscopy

Applied Spectroscopy

| PUBLISHED BY SAS — AVAILABLE FROM SAS AND OSA

  • Vol. 56, Iss. 11 — Nov. 1, 2002
  • pp: 1436–1443

Resonance Raman Scattering from Single Levitated Microparticles

Mary L. Laucks, Feng Zheng, and E. James Davis

Applied Spectroscopy, Vol. 56, Issue 11, pp. 1436-1443 (2002)


View Full Text Article

Acrobat PDF (615 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

Measurements of resonance Raman scattering from single crystalline (or amorphous) particles suspended in an electrodynamic balance have been made for inorganic and organic microparticles, potassium permanganate (KMnO4) and p-nitrosodimethylaniline (p-NDMA), respectively. The microparticle dimensions were in the range 10-50 μm. The particles were obtained by evaporating aqueous solution droplets of KMnO4 and p-NDMA (0.01 M concentration) and potassium nitrate or sodium nitrate (1.0 M concentration) added as a nonresonance Raman standard or reference. Resonance Raman spectra were obtained using laser illumination at wavelengths of 514.5 and 488.0 nm. For MnO4- particles at a laser wavelength of 514.5 nm, the fundamental symmetric stretch mode (ν1) and up to four overtones were observed. In addition, the antisymmetric stretch mode (ν3) and the combination mode (ν1 + ν3) could be seen. In p-NDMA particles, the phenyl-nitroso deformation mode (ν1) and the symmetric benzene ring-stretching mode (ν3) were observed using 488.0 nm laser radiation, but no overtones were distinguishable. As a measure of the morphological variability between particles, the ratio of the intensity of ν1 to the intensity of the largest nitrate ion (Raman) peak (normalized by the concentrations) was determined for each spectrum. This enhancement ratio or reference ratio was of order 100 and varied by 27% for 12 KMnO4 particles with 514.5 nm illumination, by 39% for 10 KMnO4 particles at 488.0 nm, and by 16% for 14 p-NDMA particles at 488.0 nm. Resonance Raman spectra obtained for KMnO4 particles before and after deliquescence indicated that photolysis occurred in the presence of water.

Citation
Mary L. Laucks, Feng Zheng, and E. James Davis, "Resonance Raman Scattering from Single Levitated Microparticles," Appl. Spectrosc. 56, 1436-1443 (2002)
http://www.opticsinfobase.org/as/abstract.cfm?URI=as-56-11-1436

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