Computer Science
Scientific paper
Jun 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aipc..430..375l&link_type=abstract
The eleventh international conference on fourier transform spectroscopy. AIP Conference Proceedings, Volume 430, pp. 375-376 (1
Computer Science
Infrared Spectrometers, Auxiliary Equipment, And Techniques, Photodetectors
Scientific paper
A comparison of step-scan and rapid-scan Fourier transform vibrational circular dichroism (FT-VCD) spectroscopy in the hydrogen-stretching region has been carried out on Nicolet Magna 850 and Bruker IFS-55 FTIR spectrometers, each equipped with an accessory VCD bench. Single enantiomer VCD spectra of (+)- and (-)-camphor with flat baselines are obtained on each instrument, both in step-scan mode and rapid-scan mode. On both instruments, the RMS noise level is less than 1×10-6 (absorbance units) in less than two-hour collections, and the noise level obtained with the step-scan method is slightly lower than that for rapid-scan. The calibrated noise level of VCD spectra obtained on the Nicolet instrument is about twice that obtained on the Bruker instrument for a comparable collection time. Our preliminary results show that with an InSb detector on the Nicolet instrument, the noise level of VCD spectra is about a half of that obtained with an MCT detector.
Freedman Teresa B.
Long Fujin
Nafie Laurence A.
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