Acta Phys. -Chim. Sin. ›› 2006, Vol. 22 ›› Issue (08): 932-936.doi: 10.1016/S1872-1508(06)60041-7

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Temperature Effect on Alignment N2 of and O2 in Laser Field

YANG Zeng-Qiang;ZHOU Xiao-Xin   

  1. College of Physics and Electronic Engineering, Northwest Normal University, Lanzhou 730070, P. R. China；Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator of Lanzhou, Lanzhou 730000, P. R. China
  • Received:2005-12-23 Revised:2006-03-02 Published:2006-08-04
  • Contact: ZHOU Xiao-Xin E-mail:zhouxx@nwnu.edu.cn

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Abstract: In terms of rigid rotor model, time- dependent Schrodinger equation is solved by using the pseudospectral method, and the alignment behaviors of diatomic molecular N2 and O2 are studied in laser field. The evolution of the field- free rotational wave- packet of the molecules after the laser pulse is over has been discussed. The results show that the alignment parameter of the molecules depends on the temperature. Both N2 and O2 molecules are better aligned at lower temperature, whereas they are poorly aligned at higher temperature. The behavior can be attributed to the population of the angular moment in the rotational wave- packet of molecules at different temperatures.

Key words: Laser field;Molecular alignment, Rotational wave-packet