II-C-4 High-Precision Structural Studies of the Antiprotonic Helium Atom p⁴He⁺ by Observing Laser Resonances with (DELTA)v = (DELTA)(n-l-1)=2

T. YAMAZAKI*, E. WIDMANN*, J. EADES* (*CERN), M. KUMAKURA, N. MORITA, H. A. TORII**, M. HORI**, T. ISHIKAWA**, F. E. MAAS**, H. TAMURA**, R. S. HAYANO** (**Univ. Tokyo), I. SUGAI^Ý, Y. FUJITA^Ý (^ÝINS, Univ. Tokyo), B. KETZER^ÝÝ, H. DANIEL^ÝÝ, F. J. HARTMANN^ÝÝ, M. HASINOFF^ÝÝ, R. POHL^ÝÝ, R. SCHMIDT^ÝÝ, T. von EGIDY^ÝÝ (^ÝÝMunchen Tech. Univ.) and D. HORVATH (KFKI Inst.)

[Phys. Rev. A 55, R3295 (1997)]

Very weak laser resonances of unfavoured transitions (n, l) -> (n+1, l-1) have been observed in metastable p⁴He⁺ atoms by using a pulsed antiproton beam. The observed wavelengths (713.578 ± 0.006 nm for l = 34 and 726.095 ± 0.004 nm for l = 35), as well as those of the known favoured transitions, are to a few ppm accounted for by a recent variational calculation of Korobov [Phys. Rev. A 54, R1749 (1996); and (unpublished)] which includes the relativistic correction to the motion of the electron.

back to CONTENTS of Research Activities II