An earlier measurement of the 2 2 S 1/2-2 2 P 1/2 Lamb shift in He ϩ by the anisotropy method is repeated in order to either verify or remove a significant discrepancy between theory and experiment. The principal change from our previous measurement is a redesigned photon detection system to eliminate a residual polarization sensitivity of the photon detectors. The result of the measurement corresponds to a Lamb shift of 14 041.13͑17͒ MHz, in excellent agreement with the theoretical value 14 041.18͑13͒ MHz. The good agreement between theory and experiment provides a clear test of the recently calculated two-loop binding correction of Ϫ1.339 MHz.
A high-precision measurement of the Lamb shift in hydrogen by theanisotropy method is presented. The result of 1057.852(15) MHz isconsistent with theory and other measurements, thereby confirming thatthe anisotropy method and its interpretation are valid at the 15 partsper million level of accuracy. For the case of He+, a discrepancyof 70(12) parts per million between theory (including two-loop bindingcorrections) and experiment remains to be resolved.PACS Nos. 3130J, 3220D
A b s t r a c t -An EPR s t u d y of t h e SO-r a d i a t i o n c e n t e r r e v e a l e d t h a t KLiSO c a t e s t h a t t h e i n t e r m e d i a t e p h a s e may b e incommensurate. The r o t a t i o n p a t t e r n of t h e EPR s p e c t r u m i n d i c a t e d t h a t t h e lowt e m p e r a t u r e p h a s e s p o s s e s s e s fewer symmetry e l e m e n t s when compared w i t h t h e ( h e x a g o n a l ) room-temperature p h a s e . The g -f a c t o r s i n t h e two p h a s e s a l s o d i f f e r c o n s i d e r a b l y . u n d e r g o e s two p h a s e t r a n s i t i o n s a t a p p r o x i m a t e t e m p e r a t u r e s : -90 0 4 C and -2 O O C . A p r e l i m i n a r y a n a l y s i s of t h e l i n e s h a p e s i n d i -1. INTRODUCTION. The room t e m p e r a t u r e s t r u c t u r e of LiKSO (LPS)
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