Skip to page content
USDA Forest Service
  
Treesearch

Research & Development Treesearch

 
Treesearch Home
About Treesearch
Contact Us
Research & Development
Forest Products Lab
International Institute of Tropical Forestry
Northern
Pacific Northwest
Pacific Southwest
Rocky Mountain
Southern
Help
 

GeoTreesearch


Science.gov - We Participate


USA.gov  Government Made Easy


Global Forest Information Service

US Forest Service
P.O. Box 96090
Washington, D.C.
20090-6090

(202) 205-8333

You are here: Home / Search / Publication Information
Bookmark and Share

Publication Information

(102 KB bytes)

Title: “Self-absorption” phenomenon in near-infrared Fourier transform Raman spectroscopy of cellulosic and lignocellulosic materials

Author: Agarwal, Umesh P.; Kawai, Nancy

Date: 2005

Source: Applied spectroscopy. Vol. 24, no. 3 (2005): Pages 385-388.

Publication Series: Not categorized

Description: While cellulosic and lignocellulosic materials have been studied using conventional Raman spectroscopy, availability of near-infrared (NIR) Fourier transform (FT) Raman instrumentation has made studying these materials much more convenient. This is especially true because the problem of laser-induced fluorescence can be avoided or minimized in FT- Raman (NIR Raman) spectroscopy. More recently, the method has also been used to generate quantitative results in cellulosic and lignocellulosic materials. Although linear dependence of Raman intensity on analyte concentration is well established, the occurrence of self-absorption (defined as absorption of Raman scattered photons by the sample itself) is known to cause problems. The influence of self-absorption in an FT-Raman spectrum is manifested in the spectral region where the sample absorbs as a result of overtone- and combination vibration bands. The net result is that the Raman band intensity or intensities are diminished. This is also true for samples that have an electronic absorption in the visible region and are being analyzed by visible Raman spectroscopy. For instance, researchers have pointed out the occurrence of self-absorption in resonance Raman spectroscopy. Compared to visible Raman spectroscopy, where only a small number of samples have strong electronic absorption, in NIR Raman, many more substances are expected to have overtone and combination-vibration transitions. Additionally, in the latter method, because sampling is deeper, self-absorption can be more problematic. For the present investigation, cellulose filter paper and spruce thermomechanical pulp (TMP) were chosen as representatives of cellulose and lignocellulose, respectively. The objective was to determine whether self-absorption was present in the spectra and which Raman bands were suppressed as a consequence.

Keywords: Self-absorption, near-infrared Fourier transform Raman spectroscopy, cellulose

Publication Notes:

  • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
  • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

XML: View XML

Citation:


Agarwal, Umesh P.; Kawai, Nancy 2005. “Self-absorption” phenomenon in near-infrared Fourier transform Raman spectroscopy of cellulosic and lignocellulosic materials. Applied spectroscopy. Vol. 24, no. 3 (2005): Pages 385-388.

 


 [ Get Acrobat ]  Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

USDA logo which links to the department's national site. Forest Service logo which links to the agency's national site.