Quanta corrected excitation spectrum of quinine sulfate. Four consecutive scans of 1 ppm quinine sulfate were made without removing the pen from the paper. Note the correct ratio (5.17) of the 248nm peak to 348nm peak.
A Unique New Corrected Spectra Spectrofluorometer With True Double-Beam Compensation In this new AMINCO Corrected Spectra Spectrofluorom eter (SPF), a unique dual-detector system provides superior correction, accuracy and range. One detector, calibrated to a radiant fluxmeter, produces corrected excitation spectra, while the other detector, calibrated to a standard lamp, produces corrected emission spectra. A half-width cell (5mm) placed before the reference PM tube corrects for solvent absorption, sometimes a critical factor at short wavelengths. This design provides a cor rected wavelength range of 200 to 650 nm in the excita tion mode and 290 to 700 nm in the emission mode. This unique design concept also provides: Π An instrument calibrated for extended periods of time without adjustment of calibration controls (there are only 5 potentiometers for excitation and 12 for emis sion). Π Quanta correction or energy correction of both excita tion and emission spectra without recalibration. Mode selection is made by a simple switch.
AMERICAN INSTRUMENT C O M P A N Y
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Freedom from the problems of stray light interference, temperature sensitivity, and the use of ultra-pure chemicals. Direct transmittance measurements by a simple re positioning of the detector.
This dual-detector system provides real-time (continuous) correction as opposed to time-shared (chopped signal) correction. A real-time system is preferred in applica tions which necessitate the use of a chopped signal, such as phosphorimetry; it is mandatory for compounds having short fluorescence or phosphorescence lifetimes. The new AMINCO Corrected Spectra SPF system may be retrofit to most AMINCO-BOWMAN™ SPF's. For more information, and/or a demonstration, contact
AMINCO
DIVISION OF TRAVENOL LABORATORIES, INC.,
Silver Spring, Maryland 20910
CIRCLE 4 ON READER SERVICE CARD ANALYTICAL CHEMISTRY, VOL. 47, NO. 8, JULY 1975 · 729 A
