A room-temperature beam of krypton atoms in the metastable 5s[3/2]2 level is demonstrated via an optical excitation method. A Kr-discharge lamp is used to produce VUV photons at 124 nm for the first-step excitation from the ground-level 4p6 1S0 to the 5s[3/2]1 level. An 819 nm Ti:Sapphire laser is used for the second-step excitation from 5s[3/2]1 to 5p[3/2]1, followed by a spontaneous decay to the 5s[3/2]2 metastable level. A metastable atomic beam with an angular flux density of 3 x 10^14 /s/sr is achieved at the total gas flow rate of 0.01 cm^3 STP/s (or 3 x 10^17 atoms/s). The dependences of the flux on the gas flow rate, laser power, and lamp parameters are investigated.
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机译：通过光激发方法证明了s原子处于5s [3/2] 2亚稳态的室温beam束。 Kr放电灯用于产生124 nm的VUV光子，用于从地平面4p6 1S0到5s [3/2] 1平面的第一步激发。 819 nm Ti：Sapphire激光器用于从5s [3/2] 1到5p [3/2] 1的第二步激发，然后自发衰减到5s [3/2] 2亚稳能级。在总气体流速为0.01 cm ^ 3 STP / s（或3 x 10 ^ 17atoms / s）的情况下，获得了具有3 x 10 ^ 14 / s / sr的角通量密度的亚稳原子束。研究了通量对气体流速，激光功率和灯参数的依赖性。
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