AC
BRIEFS
Detection of Nonexistent Molecular Ions LEWIS A . SHADOFF, Chemical Physics Research Laboratory, The Dow Chemical Co., Midland, Mich. 48640 Anal. Chem. 39, 1902 (1967) ! : ,«:|>·ϊ3ί
Static Extraction—A Novel Extraction Technique ROY KO, Battelle Memorial Institute, Pacific Northwest Labora tory, Richland, Wash. Anal. Chem. 39, 1903 (1967)
Deuterium Labeling of 2-Undecanone via Gas—Liquid Chromatography D. K. ALBERT and SEYMOUR MEYERSON, Research and Develop ment Department, American O i l Co., W h i t i n g , Ind. Anal. Chem. 39, 1904 (1967)
A Direct Transfer Technique f o r Preparing Micropellets from Thin-Layer Chromatograms f o r Infrared Identification
Optical crystals now available from Optovac: NaCI, KBr, KCI, NaF, LiF, CaF2, BaF2, SrF2, MgF2, Laser and Research Crystals
D. D. RICE, Bacchus Works, Hercules Inc., Magna, Utah A n a l . Chem. 39, 1906 (1967)
Three-Dimensionally Rotating Sample Holder f o r 14-Million Electron Volt Neutron Irradiations F. F. DYER, L. C. BATE, and J . E. STRAIN, Analytical Chemistry Division, Oak Ridge National Laboratory, Oalt Ridge Tenn. 37831 A n a l . Chem. 39, 1907 (1967)
Device f o r Transfer and Dilution of Radioactive Gases LAWRENCE A . ELFERS and MARK H E R M A N , National Center for A i r Pollution Control, 1055 Laidlaw Ave-, Cincinnati, Ohio 45237 A n a l . Chem. 39, 1909 (1967)
Simplified Solid-State Scintillation Counting on Glass Microfiber Medium in Plastic Bag f o r Hydrogen-3, Carbon-14, and Chlorine-36 in Biological and Organic Materials GOPI N. GUPTA, The Rockefeller University, New York, Ν. Υ. 10021
Cell Windows—Optovac's cell window blanks are semi-finished . . . precisely dimensioned and rough ground, ready for polishing. For many uses, a quick cloth buffing is sufficient. The technique is similar to that for restoring fogged windows, and is readily learned with practice. The savings will surprise you. Spectroscopists can now meet a budget as well as maintain a larger inventory of sampling acces sories to help get the most from their instruments. Also, difficult or messy analyses can be performed with little worry about the cost of cell damage. Every piece is inspected to maintain strict quality standards. Service is quicker, too. Common sizes are stocked. Since Optovac grows its own optical crystals, unusual pieces can be promptly fabricated from bulk material on hand. The Optovac Sodium Chloride Brochure contains price infor mation and techniques for working rocksalt crystals. Lens and Prism Blanks—Close tolerances on diameter and thickness can be maintained to facilitate optical finishing. Opto vac's 100% inspection is your guarantee of uniformly high quality. Lasers and Research Crystals—Emphasis on crystal quality and careful study of growing conditions have led to an unusual Optovac competence in its field of halide crystal preparation. A new Optical Maser and Doped Crystal Brochure by Optovac contains information on polished and coated rods, laser blanks, and doped research crystals. In addition to the Sodium Chloride and Optical Maser Brochures, a 56-page General Catalog is available. Transmission curves, index of refraction data, and other physical properties are included for all Optovac crystals. Write for your free literature, today.
OPTOVAC
OPTOVAC, INC. NORTH BROOKFIELD, MASS. 0153 Tel: (617) 867-3767
Anal. Chem. 39, 191 I (1967) Circle No. 60 on Readers' Service Card VOL. 39, NO. 14, DECEMBER 1967
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