We report the decay dynamics from the highly excited vibrational levels of the E 0g+ (3P2) ion-pair state of I2. Strong UV fluorescence belonging to the D 0u+ (3P2) → X 1Σg+ transition was observed upon the excitation of the E 0g+ (3P2) (vE = 77 and 78) state. The vibrational levels populated in the D 0u+ (3P2) state were found to be located at slightly higher energies than the vibrational levels of the laser-excited E 0g+ (3P2) state. The vibrational levels populated in the D 0u+ (3P2) state were restricted to those which have relatively large Franck-Condon factors between the laser-prepared vibronic levels. The absorption and stimulated emission rate in the presence of thermal radiation strongly suggests that the population in the D 0u+ (3P2) state was induced by the absorption of blackbody radiation. The energy partitioning process in the high vibrational levels in the E 0g+ (3P2) state was found to be totally different from that in the lower levels (vE = 0-2) where amplified spontaneous emission was a major relaxation pathway.

中文翻译：

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E 0g +（3P2）离子对I2的高度振动激发水平从黑体辐射诱导的种群转移动力学。

我们报告了I 2的E 0g +（3P2）离子对状态的高激发振动能级引起的衰减动力学。在激发E 0g +（3P2）（vE = 77和78）状态时，观察到了属于D 0u +（3P2）→X1Σg+跃迁的强紫外荧光。发现在D 0u +（3P2）状态下产生的振动能级比在激光激发的E 0g +（3P2）状态下产生的振动能级稍高。在D 0u +（3P2）状态下产生的振动能级被限制为在激光制备的电子振动能级之间具有较大Franck-Condon因子的振动能级。存在热辐射时的吸收率和受激发射率强烈表明，D 0u +（3P2）状态的种群是由黑体辐射的吸收诱导的。