ifíp «5 iHs^eiSPi 111 LEGAL NOTICE δ«!»?»!*·..« 'í' :-!w',i' di Τ 'lit m This documentwaspreparedunder the sponsorship of the Commission of the European ■ill«»« Atomiic c Energy Community(EURATOM). m fill® Neither the EURATOM Commission, its contractors nor any person acting on their behalf : — Make any warranty or representation, express or implied, with respect to the accuracy, ipl10- completeness, or usefulness of the information contained in this document, or that the use of any information, apparatus, method, or process disclosed in this document may not infringe privately owned rights; or infrineDrivatelvriehts:¡'¡.Wil ■to Assume any liability with respect to the use of, or for damages resulting from the use of or process disclosed in this document, m Jm alp ine autnors names are listed m aipnaoeticai order. mm rhis reprint is intended for restricted distribution only. It reproduces, by kind permission of the publisher, an article from "APPLIED PHYSICS LETTERS", Vol. 2. No. 11 1963, 224225. For further copies apply to American Institute of Physics, 335 East 45 Street — New York 17, N.Y. {U.S.A.). Dieser Sonderdruk ist für eine beschränkte Verteilung bestimmt. Die Wiedergabe des vorliegenden in „APPLIED PHYSICS LETTERS,,, Vol. 2, Nr. 11 1963, 224225 erschienenen Aufsatzes erfolgt mitfreundlicher Genehmigung des Herausgebers. Bestellungen weiterer Exemplare sind an American Institute of Physics, 335 East 45 Street — New York 17, N.Y.