If you've been waiting for Photoacoustic Spectroscopy to come of a g e . . . ...wait no longer! With our Model 6 0 0 1 PAS you c a n run UV-VIS near IR a b sorption spectra of solids, li quids and gel samples. With features such as: • Spectral range 2 0 0 nm to 3 0 0 0 nm • Resolution 2 nm to 64 nm ° Scan rate 2 0 0 n m / m i n to 1 nm/min ° Depth adjust-depends on sample-usually 2 0 μπη t o ΙΟΟμΓΤΙ • One-day operator traininglearning t o use the M 6 0 0 1 is simple • Almost no sample prepa ration • Easy sample changing • All reflective optics » Microprocessor control • A d v a n c e d Signal Process ing • Annotated results Until recently you had to build your own Photoacoustic Spectrometer. Now EG&G PRINCETON APPLIED RESEARCH brings you a third generation instrument with remarkable performance. Consider our PAS as a supple ment to your current analytical methods.
Photoacoustic spectroscopy provides optical absorption spectra similar to that o b tained from conventional transmittance or reflectance spectroscopy. PAS runs samples which are difficult or impossible with spec trophotometry. By generating an acoustic signal from a sample exposed to modulated monochromatic light, PAS bypasses problems posed by opaque samples, by samples which scatter light, and by turbid liquids. Since PAS is inherently insen sitive to the effects of scat tering or reflection, only that portion of the incident light actually absorbed c a n con tribute to the acoustic signal.
EG&G PRINCETON
Samples with high optical a b sorption coefficient yield a larger PAS signal, so the technique is ideal for opaque samples and for powders. The Model 6 0 0 1 PAS incor porates our very latest lock-in and microprocessor tech nology to give you clean, high resolution spectra in just a few minutes. Three curves c a n be stored simultaneously, usually sample, blank, and reference. Thus, differential, ratiometric and ratiometric comparison spectra c a n be obtained easily. You must find out more about PAS if you're working in spectrosc o p y - w e ' v e m a d e it easy. Write or call Jon Noonan to day for our bibliography, full color wall chart and brochure.
APPLIED
RESEARCH
P. O. BOX 2565 · PRINCETON, NJ 0 8 5 4 0 · 609/452-2111 Circle RS #1 68 f o r additional i n f o r m a t i o n o n l y .
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ANALYTICAL CHEMISTRY, VOL. 50, NO. 12, OCTOBER 1978 · 1085 A
