Foreign gas pressure broadening and shifts of the 2S–4S two-photon transition in lithium
W DeGraffenreid; Sarah C Campbell; Craig J Sansonetti; W DeGraffenreid; National Institute of Standards and Technology, Gaithersburg, MD 20899-8422, USA; Sarah C Campbell; National Institute of Standards and Technology, Gaithersburg, MD 20899-8422, USA; Craig J Sansonetti; National Institute of Standards and Technology, Gaithersburg, MD 20899-8422, USA
Журнал:
Journal of Physics B: Atomic, Molecular and Optical Physics
Дата:
2003-05-28
Аннотация:
We have observed broadening and shift of the 2S–4S Doppler-free two-photon transition of atomic Li by collisions with neon and argon buffer gases in a heat-pipe oven. Measured broadening and shift rates are presented and compared with theoretical predictions calculated in the impact approximation using three different interaction potentials. A superposition of polarization and modified Fermi potentials gives good agreement with the experimental data.
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