Thermionic emission (delayed ionization) experiments have been performed on nanosecond laser excited gas-phase C₆₀/C₇₀ molecules. Time resolved velocity-map-imaging spectrometer is used to measure a series of photoion spectra in a wide range of time delay. The position distribution features of photoions recorded in each spectrum allow us to well identify a specific ionic species originating from pure delayed ionization process, namely from C₆₀/C₇₀ electron emission without contamination from other decay channels to be activated when molecules have an energy required for thermionic emission. Hence, thermionic emission behaviors for hot C₆₀/C₇₀ molecules can be obtained precisely, which may have significance for improving determination precisions of some basic decay parameters of neutral fullerene molecules.

已对纳秒级激光激发的气相C ₆₀ / C ₇₀分子进行了热电子发射（延迟电离）实验。时间分辨速度图成像光谱仪用于在很宽的延时范围内测量一系列光子光谱。在每个光谱中记录的光离子的位置分布特征使我们能够很好地识别出源自纯延迟电离过程的特定离子物种，即源自C ₆₀ / C ₇₀电子发射，而不会受到分子具有所需能量时被其他衰变通道激活的污染用于热电子发射。因此，热C ₆₀ / C _70的热电子发射行为 可以精确获得分子，这对于提高中性富勒烯分子的一些基本衰变参数的测定精度具有重要意义。