| 摘 要： | Using the optical-optical double resonance (OODR) technique, we have studied the collisional broadening of some 21△g ← B1∏u lines in Na2 molecules. A single line Ar+ laser is used to pump the sodium dimers from thermally populated ground state X1∑g+ level to the intermediate B1∏u state. Then, a single-mode diode laser is used to probe the doubly excited 21△g state. The broadening rate coefficient is determined from the slope of the total linewidth versus Ne density curve. We obtain the average value kbr = (1.1 ± 0.5) × 10-s cm3s-1. The collisional excitation transfer between rotational levels of the B1∏u state (I.e., B1∏u(2,83/84) ← B1∏u(2, 82)) is 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 of 1.25 × 106 and 1.07 × 106 s-1 are obtained, respectively.
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