Diamond-like films have been deposited by dc plasma chemical vapor deposition(CVD).During deposition,the characteristics of the plasma have been measured by means of the Langmuir single probe.The structure of the depo...Diamond-like films have been deposited by dc plasma chemical vapor deposition(CVD).During deposition,the characteristics of the plasma have been measured by means of the Langmuir single probe.The structure of the deposits has been studied by X-ray diffraction,Raman spectroscopy and Fourier transform infrared spectroscopy.展开更多
During the course of diamond growth by de plasma chemical vapor deposition and microwave plasma chemical vapor deposition,characteristics of the plasma were measured by Langmuir single probe,double probe,emission spec...During the course of diamond growth by de plasma chemical vapor deposition and microwave plasma chemical vapor deposition,characteristics of the plasma were measured by Langmuir single probe,double probe,emission spectrometer and microwave interferometer.The relationships between plasma parameters and the concentration of hydrocarbon,the power,pressure and the gas flow rate are discussed.展开更多
Diamond thin films were produced by microwave plasma chemical vapor deposition.The deposit is identified by X-ray diffraction,Raman spectroscopy and Scanning electron microscopy.During the course of diamond growth,the...Diamond thin films were produced by microwave plasma chemical vapor deposition.The deposit is identified by X-ray diffraction,Raman spectroscopy and Scanning electron microscopy.During the course of diamond growth,the characteristics of the plasma have been measured by means of the Langmuir double probe and emission spectrometer.展开更多
Research on the development of the optical frequency standard based on trapped and cold 40 Ca+ with the 4s2S1/2-3d2D5/2 clock transition at 729nm is reported. A single calcium ion was trapped and laser cooled in the P...Research on the development of the optical frequency standard based on trapped and cold 40 Ca+ with the 4s2S1/2-3d2D5/2 clock transition at 729nm is reported. A single calcium ion was trapped and laser cooled in the Paul trap and stay in trap for more than 15 days. The linewidth of a 729nm laser was reduced to less than 10Hz by locking to a cavity for longer than 50 hours uninterruptedly. The overall systematic uncertainty of the clock transition has been characterized to be better than 6.5×10 16 . The absolute frequency of the clock transition was measured at 10 15 level using an optical frequency comb referenced to a Hydrogen maser, which was calibrated to the SI second through the global positioning system (GPS). The frequency value was 411042129776393.0(1.6)Hz after the correction of the systematic shifts.展开更多
文摘Diamond-like films have been deposited by dc plasma chemical vapor deposition(CVD).During deposition,the characteristics of the plasma have been measured by means of the Langmuir single probe.The structure of the deposits has been studied by X-ray diffraction,Raman spectroscopy and Fourier transform infrared spectroscopy.
文摘During the course of diamond growth by de plasma chemical vapor deposition and microwave plasma chemical vapor deposition,characteristics of the plasma were measured by Langmuir single probe,double probe,emission spectrometer and microwave interferometer.The relationships between plasma parameters and the concentration of hydrocarbon,the power,pressure and the gas flow rate are discussed.
文摘Diamond thin films were produced by microwave plasma chemical vapor deposition.The deposit is identified by X-ray diffraction,Raman spectroscopy and Scanning electron microscopy.During the course of diamond growth,the characteristics of the plasma have been measured by means of the Langmuir double probe and emission spectrometer.
基金supported by the National Basic Research Program of China(2005CB724502 and 2012CB821301)National Natural Science Foundation of China (10274093, 60490282, 10874205 and 11034009)Chinese Academy of Sciences
文摘Research on the development of the optical frequency standard based on trapped and cold 40 Ca+ with the 4s2S1/2-3d2D5/2 clock transition at 729nm is reported. A single calcium ion was trapped and laser cooled in the Paul trap and stay in trap for more than 15 days. The linewidth of a 729nm laser was reduced to less than 10Hz by locking to a cavity for longer than 50 hours uninterruptedly. The overall systematic uncertainty of the clock transition has been characterized to be better than 6.5×10 16 . The absolute frequency of the clock transition was measured at 10 15 level using an optical frequency comb referenced to a Hydrogen maser, which was calibrated to the SI second through the global positioning system (GPS). The frequency value was 411042129776393.0(1.6)Hz after the correction of the systematic shifts.
