VARIAN associates - ACS Publications

---

ANALYST'S C O L U M N tonce in one's field is n o t enough t o m a k e t h e worth-while contribution t o h u m a n knowledge. F O B some years t h e N e w York So­ ciety of Electron Microscopists, with headquarters a t t h e New York Academy of Sciences, 2 E a s t 63rd St., New York, has been rendering a service t o its specialty through t h e Bibliography Sendee. T o keep t h e Bibliography members informed a b o u t new develop­ ments within t h e service a n d t o permit discussion of various problms b y mem­ bers, a newsletter will henceforth b e issued quarterly. T h e first one follows in p a r t : The International Committee on Elec­ tron Microscopy. T h e UNESCO a p ­ pointed an international committee of ex­ perts; we were fortunate in having a visit paid to us by its distinguished chairman, Professor Bodo von Borries, Dusseldorf, Germany. This name, synonymous with vital pioneering work in the development of the electron microscope, must be famil­ iar to every user of the instrument. D r . von Borries felt very strongly that t h e Bibliography supplies a basic need of the present day research scientist, whose time does not increase proportionately with the amount of literature being published. "Since work in electron microscopy is spread over many nations, we were un­ fortunately forced t o realize t h a t investi­ gations which had been carried out in one country at an early date and in detail were either repeated later in another country, or else did not stimulate any follow-up for a very long time, simply because the re­ sults failed t o become known. This represents a delay in progress by the at­ tendant misdirection of valuable man­ power. This delay could be avoided by the exchange of data made possible by the Bibliography." He therefore pledged his full support. T h e speed and efficiency of t h e whole project depend to a great extent on mini­ mum delay in obtaining publications, and a real service could be performed by each national society by insisting on prompt submission of references or reprints t o NYSEM. International Membership. Our mem­ bership has passed 250. An earlier survey indicated that 17 countries were repre­ sented, among them being Austria, Bel­ gium, Canada, Denmark, France, Ger­ many, India, Japan, The Netherlands, New Zealand, Norway, Sweden, Switzerland, United Kingdom of Great Britain, United States, Uruguay, and Venezuela. At a time when membership was 191, a survey of the field of use of the electron microscopes and Bibliography showed that 57 were devoted exclusively to biological work, and 77 to nonbiological work only. VOLUME

2 7, N O . 2, F E B R U A R Y

N-M-R-

Completes Your Spectroscopy Team Perplexing chemical problems which resist solution by other methods may often be solved by applying the revolutionary High Resolution n-m-r (nuclear magnetic resonance) technique — a powerful new member of the spectroscopy team. Varian n-m-r Spectrometers are being used daily in many laboratories for detailed functional-group analyses of organic and petrochemical mixtures. And in such rapidly expanding fields as silicon, boron and fluorine chemistry, n-m-r is providing penetrating insight into molecular structures. The newly-styled Model V-4300A High Resolution n-m-r Spectrometer now incorporates an exclusive Varian "sample spinner." By mechanically rotat­ ing the sample during signal observation, tiny magnetic field inhomogeneities can be averaged out. Result: the "resolving power" of the Spec­ trometer is extended to a higher degree than ever before.

THIS IS N-M-R AT WORK (Numbernoioser.es) INTERPRETATION DATA neatly s h i n t o lower applied fields.'η • bfJ Sample: 5*UF 6 ppm exceeds the 460 ppm Λ Λ : o t a r ed ^ 9556 BrFs P Volume: 0.05 cc. /oSsib,e 10 interpret th.s ,n . m . »" » ^ p e a k a n d Signals observed:F b„„ds in UF, C . m p . , . « - ^ « a r a p i d , n o n . d estruc Frequency : 30 mc. Field • 7500 gauss Sweep rate: 0.75 gauss/sec. Zero of reference; Magnetic 19 field at F nuclei in r BrFs as a tetragonal pyramid. ocycfobutane. B,F. as a t * * . » » ' perfluorocyclobutane. τ ο REFERENCE WIMr-1 ΡλΡ MAI M

NUCLEAR

s

m

^ ^ S ^ m ^ ^ BrFj m a m

FOR

COMPLETE

-200

-400

-600

-800

INFORMATION.

On Varian's V-4300A High Resolution n-m-r Spectrometer, as well as the Model V-4200 Variable Frequency n-m-r Spectrometer, and associated magnet systems, contact the Special Products Division for:

V A R I A N P A L O

A L T O

4 ,

Technica/ Buf/efîns Data Sheets η · m · r Table

associates C A L I F O R N I A

M I C R O W A V E TUBES — S P E C I A L PRODUCTS For further information, circle number 17 A on Readers' Service Card, page 49 A

195S

17 A