Nonsequential double ionization （NSDI） processes of nonaligned diatomic molecules N2 and O2 are studied using the S-matrix theory. Our results show that the NSDI process significantly depends on the molecular symmet...Nonsequential double ionization （NSDI） processes of nonaligned diatomic molecules N2 and O2 are studied using the S-matrix theory. Our results show that the NSDI process significantly depends on the molecular symmetry and structure. The ratio of NSDI rate to single ionization rate as a function of the field intensity is obtained. It is found that N2 behaves closely with its companion atom Ar in the ratios over the entire intensity range, while O2 exhibits an obvious suppression effect, which is qualitatively consistent with the experiment.展开更多
Since the start of the Ukraine crisis in 2022, countries in the Global South have not simply blindly followed the West's request to isolate and sanction Russia. Instead, they have pursued a new nonalignment stance...Since the start of the Ukraine crisis in 2022, countries in the Global South have not simply blindly followed the West's request to isolate and sanction Russia. Instead, they have pursued a new nonalignment stance that refuses to take sides. Countries in the Global South responded negatively to, and sometimes even outright opposed, the West's isolation of Russia through multilateral means. Some countries have passively cooperated with Western sanctions against Russia,while others have actively resisted them. Moreover, the countries of the Global South continue to maintain or even strengthen friendly bilateral exchanges with Russia. Indeed, when the Ukraine crisis emerged,countries in the Global South were facing their own urgent survival and development challenges. They were dissatisfied with the current liberal order and the selfish and narrow diplomatic behavior of the West. They have also grown stronger and more mature throughout the process of the global order becoming increasingly multipolar, and they anticipate that the future international order will better serve their interests. The countries of the Global South are becoming a stabilizing force in a turbulent and changing world, and they are promoting the development of an international order defined by multipolarity.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant Nos. 11074026, 11074155, and 11104225)the Program for New Century Excellent Talents in University of the Ministry of Education of China (Grant No. NCET-08-0883)the National Basic Research Program of China (Grant No. 2011CB808100)
文摘Nonsequential double ionization （NSDI） processes of nonaligned diatomic molecules N2 and O2 are studied using the S-matrix theory. Our results show that the NSDI process significantly depends on the molecular symmetry and structure. The ratio of NSDI rate to single ionization rate as a function of the field intensity is obtained. It is found that N2 behaves closely with its companion atom Ar in the ratios over the entire intensity range, while O2 exhibits an obvious suppression effect, which is qualitatively consistent with the experiment.
文摘Since the start of the Ukraine crisis in 2022, countries in the Global South have not simply blindly followed the West's request to isolate and sanction Russia. Instead, they have pursued a new nonalignment stance that refuses to take sides. Countries in the Global South responded negatively to, and sometimes even outright opposed, the West's isolation of Russia through multilateral means. Some countries have passively cooperated with Western sanctions against Russia,while others have actively resisted them. Moreover, the countries of the Global South continue to maintain or even strengthen friendly bilateral exchanges with Russia. Indeed, when the Ukraine crisis emerged,countries in the Global South were facing their own urgent survival and development challenges. They were dissatisfied with the current liberal order and the selfish and narrow diplomatic behavior of the West. They have also grown stronger and more mature throughout the process of the global order becoming increasingly multipolar, and they anticipate that the future international order will better serve their interests. The countries of the Global South are becoming a stabilizing force in a turbulent and changing world, and they are promoting the development of an international order defined by multipolarity.
