Removal of I_2 absorption lines from 514-nm excited Raman spectra
- 15 May 1978
- journal article
- Published by Optica Publishing Group in Applied Optics
- Vol. 17 (10), 1621-1623
- https://doi.org/10.1364/ao.17.001621
Abstract
The intense excitation of an Ar+ laser operating at 514 nm enhances the grating ghosts and general stray light within most double monochromators at wavelengths close to the exciting line. The I2 filter technique provides an effective means of reducing this interference and, in so doing, makes possible the measurement of Raman bands close to the exciting line. However, at an instrument resolution less than 3 cm−1, the I2 absorption spectrum seriously interferes with the Raman spectrum. Ratioing the Raman spectrum with a white light absorption spectrum of I2 removes the I2 absorption lines. However, with slit widths −1, the wavelength reproducibility of the monochromator on successive scans is not high enough to insure successful ratioing. A technique is described for obtaining, approximately within the same time interval, the Raman spectra and white light spectrum at each wavelength that data are acquired. This procedure accurately removes the I2 absorption spectrum.This publication has 3 references indexed in Scilit:
- A Computer Controlled Raman Spectrometer SystemApplied Spectroscopy, 1976
- Absorption of Unshifted Scattered Light by a Molecular I2 Filter in Brillouin and Raman ScatteringApplied Physics Letters, 1971
- On-Line Acquisition of Data from Raman and Infrared Spectrometers with a Time-Sharing ComputerApplied Optics, 1970