title: [The multicolour three-photon resonant ionization spectrum studies in uranium atom].
abstract: The multicolour three-photon resonant ionization spectra of 238U 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 spatially 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.
authors.affiliation: Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 130022 Changchun.
authors.forename: G
authors.initials: G
authors.lastname: Shi
authors.forename: H
authors.initials: H
authors.lastname: Du
authors.forename: L
authors.initials: L
authors.lastname: Wang
authors.forename: C
authors.initials: C
authors.lastname: Jin
authors.forename: W
authors.initials: W
authors.lastname: Wang
authors.forename: D
authors.initials: D
authors.lastname: Zhou