Title :
Measurement of the 2/sup 3/P/sub 0/-2/sup 3/P/sub 1/ helium fine structure interval
Author :
Minardi, F. ; Blanchini, G. ; Busoni, S. ; Concio, P. ; Giusfredi, G. ; Pavone, Francesco S. ; Inguscio, M.
Author_Institution :
Eur. Lab. for Non-Linear Spectroscopy, Firenze, Italy
Abstract :
In this paper we describe a measurement of the helium 2/sup 3/P/sub 0/-/sup 2/3P/sub 1/ interval, obtained from a full optical approach in an atomic beam of metastable He. Direct frequency determination and control of systematic effects leads to an accuracy of 3 kHz. By comparison with a precise atomic theory, a 50 ppb accurate determination of the fine structure constant /spl alpha/ will be possible.
Keywords :
Doppler shift; Lamb shift; atomic beams; constants; fine structure; helium neutral atoms; metastable states; relativistic corrections; He; Lamb dip; accurate determination; atomic beam; control of systematic effects; direct frequency determination; fine structure interval measurement; full optical approach; fundamental constants; metastable He; second order Doppler shift; spurious magnetic fields role; Atomic beams; Frequency measurement; Frequency modulation; Helium; Laser beams; Laser transitions; Light scattering; Magnetic field measurement; Optical scattering; Testing;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 1998 Conference on
Conference_Location :
Washington, DC, USA
Print_ISBN :
0-7803-5018-9
DOI :
10.1109/CPEM.1998.700112
