Infrared vibrational circular dichroism of alanine in the mid-infrared region: isotopic effects

1988 ◽  
Vol 110 (21) ◽  
pp. 6967-6970 ◽  
Author(s):  
Max. Diem
Keyword(s):  
Circular Dichroism ◽  
Infrared Region ◽  
Vibrational Circular Dichroism ◽  
Mid Infrared ◽  
Circular Dichroïsm ◽  
Isotopic Effects

scholarly journals Reaction Monitoring Using Mid-Infrared Laser-Based Vibrational Circular Dichroism

Chirality ◽  
2014 ◽  
Vol 26 (9) ◽  
pp. 490-496 ◽  
Author(s):  
Anja Rüther ◽  
Marcel Pfeifer ◽  
Víctor A. Lórenz-Fonfría ◽  
Steffen Lüdeke
Keyword(s):  
Circular Dichroism ◽  
Infrared Laser ◽  
Vibrational Circular Dichroism ◽  
Reaction Monitoring ◽  
Mid Infrared ◽  
Circular Dichroïsm

Step-Scan Fourier Transform Vibrational Circular Dichroism Measurements in the Vibrational Region above 2000 cm−1

1997 ◽  
Vol 51 (4) ◽  
pp. 508-511 ◽  
Author(s):  
Fujin Long ◽  
Teresa B. Freedman ◽  
Thomas J. Tague ◽  
Laurence A. Nafie
Keyword(s):  
Fourier Transform ◽  
Circular Dichroism ◽  
Near Infrared ◽  
Optical Transition ◽  
Signal To Noise Ratio ◽  
Infrared Region ◽  
Vibrational Circular Dichroism ◽  
Ft Ir ◽  
Combination Bands ◽  
Circular Dichroïsm

We present the results of a new Fourier transform infrared vibrational circular dichroism (FT-IR-VCD) spectrometer optimized for performance in the near-infrared region above 2000 cm−1. The instrument is capable of operating in either the conventional rapidscan mode or the step-scan mode and is designed around the Bruker IFS 55 FT-IR spectrometer. We find that in the region of hydrogen stretching, the instrument performs as well as or better than (depending on the spectral coverage and resolution desired) a corresponding dispersive grating VCD spectrometer, with noise levels at approximately 10−6 Δ A units for a two-hour collection at 8-cm−1 resolution. The performance is approximately a factor-of-2 better in signal-to-noise ratio in optimized step-scan operation in comparison to the corresponding results in rapid-scan operation. The reasons are traced to advantages in electronic filtering and undersampling efficiency in step-scan mode. It is expected that the advantages of step-scan will increase with increasing optical transition frequency, such as the region of overtone and combination bands between 4000 and 8000 cm−1.

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