1 Introduction Thousands of energy levels of uranium atom are being found, but it is difficult to identify and assign them because of the complicatedness of UI spectrum. Most of the information about the uranium atom ...1 Introduction Thousands of energy levels of uranium atom are being found, but it is difficult to identify and assign them because of the complicatedness of UI spectrum. Most of the information about the uranium atom energy levels was obtained from the analysis of the emission or absorption spectra got in conventional sources, such as hollow cathode or electrodeless discharge lamps. As higher excited states are thinly populated in these conventional sources, most of the data available in literature pertain to low and medium展开更多
Ⅰ. INTRODUCTION Since the ionizing potential of uranium is 49958 cm<sup>-1</sup>, at least three photons of wavelengths in visible region are required to ionize an uranium atom from its ground state or on...Ⅰ. INTRODUCTION Since the ionizing potential of uranium is 49958 cm<sup>-1</sup>, at least three photons of wavelengths in visible region are required to ionize an uranium atom from its ground state or one of the low-lying metastable states. When a single-colour laser beam acts with the uranium vapor, the uranium atom can sequentially absorb three photons and ionize, but the cross sec-展开更多
文摘1 Introduction Thousands of energy levels of uranium atom are being found, but it is difficult to identify and assign them because of the complicatedness of UI spectrum. Most of the information about the uranium atom energy levels was obtained from the analysis of the emission or absorption spectra got in conventional sources, such as hollow cathode or electrodeless discharge lamps. As higher excited states are thinly populated in these conventional sources, most of the data available in literature pertain to low and medium
文摘Ⅰ. INTRODUCTION Since the ionizing potential of uranium is 49958 cm<sup>-1</sup>, at least three photons of wavelengths in visible region are required to ionize an uranium atom from its ground state or one of the low-lying metastable states. When a single-colour laser beam acts with the uranium vapor, the uranium atom can sequentially absorb three photons and ionize, but the cross sec-
