Journal
ANALYTICAL CHEMISTRY
Volume 75, Issue 16, Pages 4312-4318Publisher
AMER CHEMICAL SOC
DOI: 10.1021/ac034169h
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Three different Raman microspectroscopic imaging methodologies using a single experimental configuration are compared; namely, point and line mapping, as representatives of serial imaging approaches, and direct or wide-field Raman imaging employing liquid-crystalline tunable filters are surveyed. Raman imaging data acquired with equivalent low-power 514.5-nm laser excitation and a cooled CCD camera are analyzed with respect to acquisition times, image quality, spatial resolution, intensity profiles along spatial coordinates, and spectral signal-to-noise ratios (SNRs). Point and line mapping techniques provide similar SNRs and reconstructed Raman images at spatial resolutions of -1.1 mum. In contrast, higher spatial resolution is obtained by direct, global imaging (similar to313 nm), allowing subtle morphological features on test samples to be resolved.
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