ROUTINE WAVE-NUMBER CALIBRATION OF AN FT-RAMAN SPECTROMETER

A readily automated procedure for testing and calibrating the wavenumb er shift scale of an FT-Raman spectrometer is described. The procedure uses atomic lines as wavenumber standards. An apodization procedure i s used in accurately determining the line positions to a fraction of t he sampling interval. A fiber-optic bundle conveniently couples the ou tput from a hollow cathode lamp to the collection optics of the Raman accessory. Results are reported and compared for both thorium and neon atomic lines. Acetonitrile is suggested as a wavenumber shift standar d, and peak shifts have been measured for its major features. Peak shi ft values are reported for 11 lines of cyclohexane.