By G. W. Series (auth.), Professor G. Franco Bassani, Professor Massimo Inguscio, Professor Dr. Theodor W. Hänsch (eds.)
Atomic hydrogen, the best of all good atoms, has been a problem to spectroscopists and theoreticians for a few years. right here, as in related platforms like positronium, muonium and doubtless helium, the accuracy of theoretical predictions is analogous to that of experimental measurements. consequently intriguing confrontations are attainable. This including anticipated huge experimental advancements explains the robust curiosity within the symposium held in Pisa in June-July 1988. The ensuing publication thoroughly covers the precision spectroscopy of atomic hydrogen and hydrogen-like platforms, and likewise discusses facets of QED and the impact of robust fields.
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Additional resources for The Hydrogen Atom: Proceedings of the Symposium, Held in Pisa, Italy, June 30–July 2, 1988
Sample text
1. reckoned from a certain arbitrary null point. ) we obtain an expression that does not contain unknown phases in the arguments of the cosines: (3) The described experimental data reduction procedure was developed by Dr. P. Yakovlev and Dr. G. Palchikov /2/, /3/. The values of w/v and f. in (3) were obtained using a least-squares program. In the case where the velocity remains constant, reduction of the initial data yields the values of w/v and I. with an accuracy of not less than 5 ppm. It follows from (3) that to determine the Lamb frequency v it is necessary to measure the velocity of the 2s atoms, using an independent method.
R·······f·······j ...... ·r . · . :... ... ': Figure 5 : a) Fit of the experimental l ~ l ~ l ~OO KHz l l line profile (2S 1 / 2 - lODII / in hydrogen) with the calculated one. b) Difference in an expanded scale between the experimental and theoretical curves of a). 6) ; extrapolation to zero light power gives the value corrected for light shifts. Great care has been taken in the experimental set-up to avoid any stray field. In order to evaluate the effect of residual electric fields we have 54 2 Figure 6: experimental line posit ion Example tion Il00 kHz of an extrapolathe two-photon line position of versus the light power (2S 1 / 2 -10Dn / transition in hydrogen) 2 I ight power (arb.
Auxiliary H. N. LASER ~==~=========;;>I~=l12 STABILIZED . H. -... H. Ne LASER Figure 2 : Experimental set-up for the control and the measurement of the dye laser frequency To into into sweep the dye laser its beam is split and the secondary beam is driven an acousto-optic device. The frequency-shifted beam is reflected back the acousto-optic crystal so that one of the emerging beams is shifted twice. This beam then enters a reference Fabry-Perot cavity (indicated as FPR in Fig. 2) of very high finesse, whose length is locked to an 12 - stabilized 51 He-Ne laser.
