rocessor technology to UV spectroscopy and.. ΚΜη0 4
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600 m
The 340's baseline corrector can compensate spectra up to 2A; even draw a difference spectrum without using the reference beam.
monochromator stops to allow the ratio of transmittance to be measured at successive wavelengths. The result is a series of discrete digital values of transmittance associated with specific wavelengths irrespective of scanning speed or reference absorption.
Each member of the 57 series can be equipped with a digital background corrector which flattens the instrument's baseline to ± 0 . 0 0 1 A. The flat background aids interpretation of difference spectra and eliminates the need to record a baseline for every quantitative measurement. Difficult S a m p l e s . Turbid and sold samples produce photometric errors due to energy loss by scattering. The 57 series has a scattered transmission accessory where such difficult samples can be placed close to a large, endon-window, photomultiplier. Much of the scattered energy is recollected by the detector and values closer
to the time sample absorbance are recorded. The Model 3 4 0 can be equipped with a selection of integrating spheres covering its wide UV-VIS-NIR range to allow examination of solid samples by reflection.
If the tear-off card has been used, for further information contact: Instrument Division, Norwalk, CT 0 6 8 5 6 USA; Bodenseewerk Perkin-Elmer & Co., GmbH, 7 7 7 0 Ueberlingen, West Germany
... assure photometric fidelity!
PERKIN-ELMER CIRCLE 174 O N READER SERVICE CARD
