铀原子多色三光子共振电离谱研究

利用Ｎｄ：ＹＡＧ二倍频激光同步泵浦的脉冲染料激光系统、原子束装置、飞行时间质谱和Ｂｏｘｃａｒ技术测量了＾２３８Ｕ的多色三光子共振电离谱。研究了电场对铀原子第一激发态的影响。解决了如何确定三角三光子共振电离谱图中所含的单色，双色和三色共振电离峰的问题。

The Multicolour Three-photon Resonant Ionization Spectrum Studies in Uranium Atom

The multicolour three photon resonant ionization spectra of 238 U were measured by using the pulsed dye lasers system synchronously pumped by a frequency doubled Nd:YAG laser 532 nm output(operated at 10 Hz),a device for atomic beam of U,time of flight mass spectrometer and boxcar integrator.The dye laser pulses have a 6 ns duration.Beams from the dye lasers,which have the same polarization direction and are focused by lenses,entered an interaction chamber through opposite windows on a common axis and spatialy overlapped the U atomic beam.The optical pulse from dye laser DL2 was delayed to arrive at the interaction region 8 ns after the pulse from dye laser DL1;in the same way,the pulse from DL3 was delayed 8 ns after from DL2.The atomic beam device was made from stainless steel.We generated the U vapor by heating solid U in a graphite crucible by e type electron field on first excited states were studied in uranium atom.The question how to determine single colour,two colour and three colour three photon resonant ionization peak in the three colour three photon resonant ionization spectra diagram were solved.