【摘要】 利用光学双共振多光子电离光谱,测量并讨论了I₂分子的多光子跃迁通道、离子对态及转动能量弛豫。通过改变二束染料激光（ω₁:～532nm,ω₂:590～610nm）的相对延迟时间以及测量MPI信号与二束光的功率关系,把I₂的五光子电离确定为（1+2+2）过程,即:电离←离子对态←B态←X态。以B∏（O⁺u）作为中间态,对I₂的离子对态进行了测量,把一组能量在53000cm^-1附近,间隔为37cm^-1的振动序列归属为离子对态中属于I⁺(3P_1,0+I^-（¹S）组合的F（O⁺u）态的高振动激发态。最后,选择F（O⁺u）为探测态,测量了B∏（O⁺u）态的转动能量弛豫。更多还原

【Abstract】 Using optical-optical double resonance multiphoton ionization（OODR-MPI）spectroscopy,we have measured and analyzed the transition pathways,the ion-pair state and the rotational energy relaxation in I₂.In our measurement of the OODR spectra of I₂,using lasrs of wavelength～532nm & 590-610nm,aregular progression with a spacing of 37 cm^-1and total energy at 53000cm^-1has been recorded.By varing the delay time between the two dye lasers and by measuring the dependence between the MPI signal and the laser power,the transition pathway of the five-photons ionization is determined to be the（1+2+2）process of F-B-X and the upper resonance state is identified as the highly excited vibrational levels in the F（O⁺u） state arising from the ions I⁺（³P（1,0））+I^-（¹S）.Finally,the rotational energy relaxation in the B（O⁺u）state is measured with the F（O⁺u）as the probing state and the broadening of the spectral lines is discussed.更多还原