Methylmethacrylate On-Line Polymerisation Monitoring by Light-Fibre Fourier Transform near Infrared Transmission Spectroscopy and Fourier Transform Mid Infrared/Attenuated Total Reflection Spectroscopy

2001 ◽  
Vol 9 (1) ◽  
pp. 19-24 ◽  
Author(s):  
A. Olinga ◽  
R. Winzen ◽  
H. Rehage ◽  
H.W. Siesler
Keyword(s):  
Fourier Transform ◽  
Near Infrared ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Reflection Spectroscopy ◽  
Infrared Transmission ◽  
Mid Infrared ◽  
Transmission Spectroscopy ◽  
On Line

Electric-Field-Induced Reorientation of Liquid Crystalline p-Cyanophenyl-p-n-Alkylbenzoates: A Time-Resolved Study by Fourier Transform Infrared Transmission and Attenuated Total Reflection Spectroscopy

2003 ◽  
Vol 57 (5) ◽  
pp. 499-505 ◽  
Author(s):  
E. Klimov ◽  
M. Fuelleborn ◽  
H. W. Siesler
Keyword(s):  
Fourier Transform ◽  
Electric Field ◽  
Liquid Crystalline ◽  
External Perturbation ◽  
Fourier Transform Infrared ◽  
Surface Region ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Infrared Transmission ◽  
Time Resolved

Time-resolved polarization Fourier transform infrared (FT-IR) transmission and attenuated total reflection (ATR) spectroscopy were applied to investigate the reorientation phenomena of the three members of the homologous series of nematic liquid crystalline p-cyanophenyl-p-n-alkylbenzoates 6CPB, 7CPB, and 10CPB under the external perturbation of an electric field. In conjunction with a newly constructed measurement cell, this method allowed us to differentiate the response of the LC system in the surface layer and in the bulk of the cell at different temperatures and voltages. The relaxation time of the LC molecules close to the wall of the cell was found to be shorter than in the bulk. However, at a field strength of 7 V, the initial orientation in the bulk preceeds the analogous process in the surface region.

Subsurface Layer Studies by Attenuated Total Reflection Fourier Transform Spectroscopy

1977 ◽  
Vol 31 (4) ◽  
pp. 289-292 ◽  
Author(s):  
Tomas Hirschfeld
Keyword(s):  
Fourier Transform ◽  
Critical Angle ◽  
Subsurface Layer ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Data Sets ◽  
Angle Of Incidence ◽  
Reflection Spectra ◽  
Reflection Spectroscopy ◽  
A New Technique

In total reflection spectroscopy the effective sampled depth increases as the angle of incidence approaches the critical one. At each angle of incidence, successive layers within the sample are weighed differently in the overall spectrum, and the manner of this weighing changes with angle. It is thus possible in principle to deconvolute a set of spectra taken at different angles into spectra corresponding to successive depth invervals. As this angular effect is particularly marked near the critical angle, where attenuated total reflection spectra are severely distorted, the spectra usually require inversion into optical constant spectra. This has been done by a new technique that measures spectra twice at each angle with different prism materials to give the necessary data sets. Examples of such subsurface spectra are shown.

Detection of Citrus Huanglongbing by Fourier Transform Infrared—Attenuated Total Reflection Spectroscopy

2010 ◽  
Vol 64 (1) ◽  
pp. 100-103 ◽  
Author(s):  
Samantha A. Hawkins ◽  
Bosoon Park ◽  
Gavin H. Poole ◽  
Timothy Gottwald ◽  
William R. Windham ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Fourier Transform Infrared ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Reflection Spectroscopy ◽  
Citrus Huanglongbing
Sign in / Sign up

Export Citation Format

Share Document