Studies on shape resonance dynamics by photoelectron angular distribution measurements from oriented molecules

我们成功地设计并建造了一台用于研究光电子与光碎片之间的角关联的符合速度成像光谱仪。利用该装置，我们在高于CO_2分子电离阈值的光子能量处测量了O_1s光电子与CO~(2+)和O~(++)光碎片之间的动量关联图样。我们还成功地用三重符合法测量了C_2H_2分子各解离通道的C_1S光电子角分布图。对于非对称解离通道，C1s光电子角分布图样违背了反转对称性。这意味着核孔记忆被保存在照片碎片中。

We have successfully designed and constructed a new apparatus of coincidence velocity imaging spectrometer for the study of angular correlations between photoelectrons and photofragments.Using this apparatus, we have measured momentum correlation patterns between O1s photoelectrons and photofragments of CO^+ and O^+ at the photon energy above the ionization threshold of O1s of CO_2 molecules. And we have found that the O1s photoelectron angular distribution pattern violate the inversion symmetry.We have also succeeded in measuring the C1s photoelectron angular distribution patterns of C_2H_2 molecules for each dissociation channel by the triple coincidence. For asymmetric dissociation channels, the C 1s photoelectron angular distribution patterns violate the inversion symmetry. This implies that the core-hole memory is preserved in the photofragments.