Man about to meet a molecule CEC's 21-llOA Mass Spectrometer reveals secrets of molecular structure. Organic chemists, for example, prefer CEC's 21-llOA Mass Spectrometer for performing structural identification and quantitative analysis of organic material, natural or synthetic. The 21-llOA provides exceptionally high resolution, is capable of separating masses differing as little as one part in 20,000. A n d it features a combination photoplate/ electrical detector system. High resolution allows "mass defect" determination. The combination detector permits instantaneous accumulation of all data and analysis of extremely small samples using t h e photoplate; quick-look and quantitative determinations are provided by t h e electrical detector. Being the most versatile high-performance mass spectrometer, the 21-110A
accepts ion sources and ion detectors for all types of research problems. Gas Source with combination detector is used for organic chemistry, molecular structure studies in foods, bio-chemicals, pharmaceuticals, flavors & fragrances, and chemicals & petrochemicals. RF Spark Source w i t h p h o t o p l a t e detector locates trace impurities (less than 1 part in 10,000,000) in metals, semiconductors and other solids. Knudsen Cell Source with electrical detector makes thermo-dynamic equilibrium studies, heat of vaporization determinations and appearance potential measurements. Surface Ionization Source performs isotopic assay of uranium oxide and other similar materials. Circle No. 165 on Readers' Service Card
The 21-110A is t h e result of CEC's quarter-century of leadership in mass spectrometry. For complete information on this advanced instrument, call your CEC office. Or write for Bulletin CEC 21110A-X14.
Analytical & Control Division
CEC
CONSOLIDATED ELECTRODYNAMICS A SUBSIDIARY OF BELL & H O W E L L / P A S A D E N A , CALIF. 9 1 1 0 9 I N T E R N A T I 0 N A L 5 U B S I D I A R 1 E S : W O K I N G , SURREY, E N G L A N D AND FRANKFURTIMAIN, GERMANY
