Introducing the LKB 9000 Gas chromatograph-mass spectrometer The LKB M o d e l 9000 is a f u l l y equipped, combination instrument which provides simple, reliable and flexible operation for the routine mass spectrometric analysis of organic substances p u r i f i e d by the built-in gas chromatograph. It utilizes the most advanced and sophisticated methods and instrumentation for each of its important unit operations, from sample introduction into the gas chromatog r a p h t o r e c o r d i n g of a mass spectrum. Other inlet systems are provided for operation of the mass spectrometer with previously purified liquids and solids.We arejustly proud of its performance, which is eminently suited for biochemical analysis, d e t e r m i n a t i o n of trace constituents in complex mixtures, molecular structure elucidations, and studies of isotope abundance.
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Gas Chromatography for the prel i m i n a r y p u r i f i c a t i o n of organic compounds in complex mixtures is achieved w i t h coiled columns housed in a compact oven. A circulating air bath assures accurate temperature regulation in isothermal o r t e m p e r a t u r e - p r o g r a m m e d operation. Sample Enrichment in a u n i q u e patented molecule separator (per Becker and Ryhage) is carried out by t h e p r e f e r e n t i a l r e m o v a l of carrier gas from the effluent stream of the gas chromatograph. Ionization is achieved by electron impact. A u t o m a t i c regulation of electron energy provides optimal levels of ionization during operat i o n of the ion source as a gas chromatographic detector and for the reproducible production of an array of fragment ions during re-
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Components for the GLC inlet are designed to provide optimal performance with the most demanding chromatographic conditions. Minimum dead volume and effective, uniform temperature control of all parts assures symmetrical peaks with no loss of effective column efficiency, even with capillary columns and long packed columns. Write for brochure 9000A2, and list of satisfied users.
LKB INSTRUMENTS, INC., 12221 Parklawn Drive, Rockville, Maryland 20852 LKB-PRODUKTER AB, P.O. Box 76, Stockholm-Bromma 1 , Sweden. Circle No. 144 on Readers' Service Card
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cording of a mass spectrum. Mass Spectra are obtained with a rapid-scanning, single-focussing magnetic sector analyzer with sufficient resolving power for operation with compounds in a molecular weight range up to 1200. Optimal resolving power underdifferent operating conditions with externally variable ion source and collector slits.
ANALYTICAL CHEMISTRY
