Far- and mid-infrared transmission for two isomers of the endohedral metallofullerene Sc[sub 2]@C[sub 84]

1998 ◽  
Author(s):  
M. Hulman ◽  
M. Inakuma ◽  
H. Shinohara ◽  
H. Kuzmany
Keyword(s):  
Infrared Transmission ◽  
Mid Infrared ◽  
Endohedral Metallofullerene

Determination of Wavelength Accuracy in the Near-Infrared Spectral Region Based on NIST's Infrared Transmission Wavelength Standard SRM 1921

2000 ◽  
Vol 54 (3) ◽  
pp. 450-455 ◽  
Author(s):  
Stephen R. Lowry ◽  
Jim Hyatt ◽  
William J. McCarthy
Keyword(s):  
Reference Material ◽  
Standard Reference Material ◽  
Spectral Region ◽  
Near Infrared ◽  
Cost Effective ◽  
Infrared Transmission ◽  
Internal Reference ◽  
Mid Infrared ◽  
Infrared Spectral Region ◽  
Infrared Spectral

A major concern with the use of near-infrared (NIR) spectroscopy in many QA/QC laboratories is the need for a simple reliable method of verifying the wavelength accuracy of the instrument. This requirement is particularly important in near-infrared spectroscopy because of the heavy reliance on sophisticated statistical vector analysis techniques to extract the desired information from the spectra. These techniques require precise alignment of the data points between the vectors corresponding to the standard and sample spectra. The National Institute of Standards and Technology (NIST) offers a Standard Reference Material (SRM 1921) for the verification and calibration of mid-infrared spectrometers in the transmittance mode. This standard consists of a 38 μm-thick film of polystyrene plastic. While SRM 1921 works well as a mid-infrared standard, a thicker sample is required for use as a routine standard in the near-infrared spectral region. The general acceptance and proven reliability of polystyrene as a standard reference material make it a very good candidate for a cost-effective NIR standard that could be offered as an internal reference for every instrument. In this paper we discuss a number of the parameters in a Fourier transform (FT)-NIR instrument that can affect wavelength accuracy. We also report a number of experiments designed to determine the effects of resolution, sample position, and optics on the wavelength accuracy of the system. In almost all cases the spectral reproducibility was better than one wavenumber of the values extrapolated from the NIST reference material. This finding suggests that a thicker sample of polystyrene plastic that has been validated with the SRM 1921 standard would make a cost-effective reference material for verifying wavelength accuracy in a medium-resolution FT-NIR spectrometer.

TATP and TNT detection by mid-infrared transmission spectroscopy

2009 ◽  
Author(s):  
Johannes Herbst ◽  
Jürgen Hildenbrand ◽  
Jürgen Wöllenstein ◽  
Armin Lambrecht
Keyword(s):  
Infrared Transmission ◽  
Mid Infrared ◽  
Transmission Spectroscopy ◽  
Tnt Detection

Fluorotellurite glasses with improved mid-infrared transmission

2003 ◽  
Vol 331 (1-3) ◽  
pp. 48-57 ◽  
Author(s):  
M.D O’Donnell ◽  
C.A Miller ◽  
D Furniss ◽  
V.K Tikhomirov ◽  
A.B Seddon
Keyword(s):  
Infrared Transmission ◽  
Mid Infrared

Near- and Mid-Infrared Transmission Cells for the Study of Reverse Micelle Phases in Supercritical Fluids

1989 ◽  
Vol 43 (5) ◽  
pp. 812-816 ◽  
Author(s):  
J. P. Blitz ◽  
J. L. Fulton ◽  
R. D. Smith
Keyword(s):  
Ir Spectroscopy ◽  
Supercritical Fluids ◽  
Reverse Micelle ◽  
Infrared Range ◽  
Infrared Transmission ◽  
Mid Infrared ◽  
Elevated Pressures ◽  
Fluid Systems ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

The design and construction of near- and mid-infrared transmission cells for the study of liquid, gaseous, and fluid systems at elevated pressures and temperatures are described. The cells can be used to pressures as high as 800 bar and temperatures exceeding 100°C. Typical spectra of reverse micelle phases in liquid propane and supercritical xenon through the near- and mid-infrared range are presented. The utility of applying FT-IR spectroscopy, and the transmission cells described here, to study reverse micelle and microemulsion phases in supercritical fluids is clearly demonstrated.

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