Abstract：The collisional broadening of the 21Σ＋→61Σ＋ line of NaK molecule was studied using the optical-optical double resonance technique. A single-mode diode laser was set to a particular 11Σ＋(v″，J″)→21Σ＋(v′，J′) transition. Another single-mode diode laser was then used to excite the molecule from 21Σ＋(v′，J′) level to the rovibrational level of 61Σ＋. The two laser beams counterpropagated through the cell. The broadening rate coefficient was determined from the slope of the total linewidth versus potassium density curve. The rate coefficient, kbr=(1.4±0.7)×10-8 cm3·s-1,was obtained. The collisional excitation transfer between rotational levels of the 21Σ＋ state[i.e., 21Σ＋(v＝8，J＝12)→21Σ＋(v＝8，J＝13，14)] was also investigated. The rates can be determined from the relative intensities of the main peak and satellite lines, combined with a rate equation model. The rates are 6.1×106 and 5.2×106 s-1 respectively.
刘静1,2,戴康2,沈异凡2*. 利用光学-光学双共振研究谱线的碰撞增宽[J]. 光谱学与光谱分析, 2007, 27(02): 220-222.
LIU Jing1，2,DAI Kang2,SHEN Yi-fan2*. Study of Collisional Broadening of Spectral Line by Optical-Optical Double Resonance. SPECTROSCOPY AND SPECTRAL ANALYSIS, 2007, 27(02): 220-222.
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