engleski

Lithium vapour excitation at 2S to 3D two-photon resonance

We report study of processes which occur in lithium vapour under two-photon excitation of the Li(3D) state at 639.1 nm. A time-resolved technique has been used to measure the fluorescence from the Li($3D$), Li($2P$) and Li($3P$) states. We have determined radiation rates for lithium atom densities in the range 10$^{13}$-10$^{14}$ cm$^{-3}$ and laser powers (10$^{5}$ - 10$^{6}$ Wcm$^{-2}$). The ground--state lithium atom density was determined by knowing temperature and vapour pressure in a modified heat-pipe oven. The contribution to radiation rates from different processes and prospect for cross section determination of homonuclear reverse energy--pooling are discussed.

lithium vapour; two-photon excitation

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