Read e-book online My world line; an informal autobiography. PDF

By George Gamow

ISBN-10: 0670503762

ISBN-13: 9780670503766

Gamow G. My global line.. an off-the-cuff autobiography (Viking Press 1970)(ISBN 0670503762)(T)(193s)

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27] proposed a discrete model for calculating the VDW forces between the NaCl(100) surface and a probe tip. 6 nm. The AFM operation in the attractive force regime can be carried out in UHV by using the modulation technique with frequency shift detection, because the Q-factor of an oscillating cantilever is extremely high in UHV. The results obtained for Si(ll1) 7 x 7 and InP(100) demonstrate the possibility of observing surface atomic lattices and point defects [28]. In such experiments, the spatial variation of the negative frequency shift of the cantilever is used for the feedback [29].

Linear and logarithmic) can be used, depending upon the known or presumed relationship between the probing interaction and the tip-sample separation. The accuracy of imaging is strongly influenced by the feedback gain parameters. Use of very low gains keeps the tip position constant, whereas use of very high gains renders unstable the electronic circuit controlling the feedback, because the piezodrive and the current amplifier cannot respond instantaneously. Therefore the scanning should be performed with moderate gain parameters [ 8 ] , which are commonly adjusted by the user.

References 19 [lo] (a) H. Ohtani, R. J. Wilson, S. Chiang, C. M. Mate, Phys. Rev. Let?. 1988, 60, 2398. (b) J. S. Foster, J. Frommer, Nature 1988, 333, 542. [ll] (a) M. Binggeli, D. Carnal, R. Nyffenegger, H. Sigenthaler, R. Christoph, H. Rohrer, 1. Vac. Sci. Technol. B 1991,9, 1985. (b) M. Grundner, J. Halbritter, J. Appl. Phys. 1980, 51, 5396. (c) W. Lisowski, A. H. J. van den Berg, C. A. M. Kip, L. I. Hanekamp, Fresenius J. Anal. Chem. 1991, 341, 196. [12] (a) R. Berthe, J. Halbritter, Phys.

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My world line; an informal autobiography. by George Gamow

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