We study photoionization of cold rubidium atoms in a strong infrared laser field using a magnetooptical trap (MOT) recoil ion momentum spectrometer. Three types of cold rubidium target are provided, operating in two-dimension (2D) MOT, 2D molasses, and 3D MOT with densities in the orders of 10 7 atoms/cm 3 , 10 8 atoms/cm 3 , and 10 9 atoms/cm 3 , respectively. The density profile and the temperature of 3D MOT are characterized using the absorption imaging and photoionization. The momentum distributions of Rb + created by absorption of two-or three-photon illuminate a dipole-like double-peak structure, in good agreement with the results in the strong field approximation. The yielding momentum resolution of 0.12 ± 0.03 a.u. is achieved in comparison with theoretical calculations, exhibiting the great prospects for the study of electron correlations in alkali metal atoms through interaction with strong laser pulses. * zhangyz@sari.ac.cn †
The photodissociation of IBr was investigated by solving the time-dependent Schrödinger equation including the rotational degree of freedom within the wavelength 440-680 nm. Representative samples of 2D slice images and the corresponding total kinetic energy distribution P(E) resulting from photolysis of IBr molecules at ten wavelengths in the range 440-680 nm were obtained. The total kinetic energy distribution P(E) and the P(E) distribution from the respective electronic excited states A, B, C and Y in the range 440-680 nm are also given. Furthermore, the dissociation probability from the respective electronic excited states A, B, C and Y and the branching ratio of Γ(Br*/(Br + Br*)) are determined.
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