Frontier of Materials, Life and Particle Science Explored by Ultra Slow Muon Microscope “H atom laser ionization” at MLF of J-PARC July 2, 2014 All-solid-state laser system as Lyman-α driving laser From laser cabin 840 nm 212 nm Observed laser ionization of hydrogen atom by MCP signal 355 nm dump Gas cell (2.4kPa Kr-Ar mixture) W Sodium salicylate painted plate dump H+ Transportation line MCP (Micro Cannel Plate) Mass Analyzing Magnet Frontier of Materials, Life and Particle Science Explored by Ultra Slow Muon Microscope “H atom laser ionization” at MLF of J-PARC July 2, 2014 MCPシグナル / V 0.005 Lyman- α on Lyman- α off Lyman-α on Two-Photon Resonance Four-Wave Mixing 0 Kr Cell ω1 ωLy-α ω2 Lyman-α off -0.005 ω1 (212.556 nm): Input to Kr Cell ω2 (845.25 nm): Blocked ピーク高さ ω1 Time / sec ω2 レーザーに同期 (25Hz) して 水素がイオン 水素がイオン化 がイオン化している様子 を確認 ピーク高さの MCPシグナル /mV (レーザーイオン化水素量) -0.01 0.0003425 0.000343 0.0003435 0.000344 0.0003445 ω2 波長依存性を確認 14 unbound 355 nm 2p 12 10 8 121.57 nm 6 4 844 Kr Cell 845 846 波長λ / nm 847 1s H atom
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