Two‐photon excitation and ionization of H‐atoms with tunable VUV at Lyman‐α
H. Rottke, H. Zacharias, K. H. Welge
Two kinds of experiments with tunable VUV laser light have been carried out with H atoms: (1) High resolution resonant two‐photon ionization, H(1 2S1/2)+hνα→H(2 2P1/2,3/2)+ hνuv→H++e with tunable Lyman‐α light and (2) resonant tow photon excitation of high Rydberg states. H(1 2S1/2)+hνα→H(2 2P)+hνuv →H(n 2S, n 2D)→H++e followed by ionization through collisions. In both cases an atomic beam configuration has been employed and H+ ions were detected with a mass filter. The smallest bandwidth of tunable Lyman‐α radiation achieved was ∼1.0 Ghz, enough for partial resolution of the hyperfine structure doublet of the 1 2S1/2 ground state. The application to produce polarized protons by high resolution two photon ionization is discussed. Rydberg states have been excited up to n∼48 and detected by collisional ionization under the given experimental conditons.
AIP conference proceedings•Jan 1, 1982•0 citations