Doppler-Free Two-Photon Laser Spectroscopy of HgII

Abstract

The Doppler-free, two-photon 5d1' 6 s ?Sll2-5d9 6s2 2D5!2 t r a n s i t i o n i n s i n g l y i o n i z e d Hg, a t t r a c t i v e a s a n o p t i c a l f r e q u e n c y s t a n d a r h a s b e e n o b s e r v e d f o r t h e f i r s t t i m e . A few ions were confined in a r a d i o f r e q u e n c y ( r f ) t r a p and the two-pho ton t r ans i t i on was d e t e c t e d by mon i to r ing t he change i n t he f l uo rescence l i gh t s c a t t e r e d by the ions f rom a l a s e r beam t u n e d t o t h e f i r s t r e s o n a n c e t r a n s i t i o n a t 194 nm. The r a d i a t i v e l i f e t i m e o f t h e s t a t e and t h e a b s o l u t e wavenumber o f t he two-pho ton t r ans i t i on were measured t o b e 0 . 0 9 0 ( 1 5 ) S and 17 757.15?(3) cm-' r e s p e c t i v e l y .