The effect of delay time on photoelectron spectra and state populations of a four-level ladder K2 molecule is investigated by a pump1–pump2–probe pulse via the time-dependent wave packet approach. The periodical mot...The effect of delay time on photoelectron spectra and state populations of a four-level ladder K2 molecule is investigated by a pump1–pump2–probe pulse via the time-dependent wave packet approach. The periodical motion of the wave packet leads to the periodical change of the photoelectron spectra. The Autler–Townes triple splitting appears at zero delay time, double splitting appears at nonzero delay time between pump1 and pump2 pulses, and no splitting appears at nonzero delay time between pump2 and probe pulses. The periodical change of the state populations with the delay time may be due to the coupling effect between the two pulses. It is found that the selectivity of the state populations may be attained by regulating the delay time. The results can provide an important basis for realizing the optical control of molecules experimentally.展开更多
Polypropene （PP） plastics can be effectively degraded by natural volatile con- stituents from Ledum palustre catalyzed by atmospheric air dielectric barrier （DBD） plasma. The electron spin resonance （ESR） result...Polypropene （PP） plastics can be effectively degraded by natural volatile con- stituents from Ledum palustre catalyzed by atmospheric air dielectric barrier （DBD） plasma. The electron spin resonance （ESR） result indicates that the volatile constituents produce radicals in aerobic condition energized by power sources such as light, UV, plasma and so on. The degradation is a novel chemically oxidative way and it is initiated by a series of radical reactions. Lots of active cud oxidative species, radicals, products cud high euergy electromagnetic field in plasma aggravate the degradation process. The results about PP maximum tensile strength （Crbmax） confirm this conclusion. PP plastic heavily loses its extensibility, mechanical integrity and strength in a short time after suffering a synergetic treatment of the herb extract and air DBD plasma with no toxic residues left. The components of herb extract keep almost unchanged and may be reused. This study offers a new approach to manage and recycle typical plastics.展开更多
基金Project supported by the National Natural Science Foundation of China(Grant Nos.11704178 and 11764041)the Scientific Research Fund of Hunan Provincial Education Department,China(Grant No.15B204)
文摘The effect of delay time on photoelectron spectra and state populations of a four-level ladder K2 molecule is investigated by a pump1–pump2–probe pulse via the time-dependent wave packet approach. The periodical motion of the wave packet leads to the periodical change of the photoelectron spectra. The Autler–Townes triple splitting appears at zero delay time, double splitting appears at nonzero delay time between pump1 and pump2 pulses, and no splitting appears at nonzero delay time between pump2 and probe pulses. The periodical change of the state populations with the delay time may be due to the coupling effect between the two pulses. It is found that the selectivity of the state populations may be attained by regulating the delay time. The results can provide an important basis for realizing the optical control of molecules experimentally.
基金supported by National Natural Science Foundation of China (No.20706060)Specialized Research Fund for the Doctoral Program of Higher Education of China (No.20070425515)+1 种基金Natural Science Foundation of Shandong Province,China (No.Q2007B06)PetroChina Innovation Foundation (No.07E1022)
文摘Polypropene （PP） plastics can be effectively degraded by natural volatile con- stituents from Ledum palustre catalyzed by atmospheric air dielectric barrier （DBD） plasma. The electron spin resonance （ESR） result indicates that the volatile constituents produce radicals in aerobic condition energized by power sources such as light, UV, plasma and so on. The degradation is a novel chemically oxidative way and it is initiated by a series of radical reactions. Lots of active cud oxidative species, radicals, products cud high euergy electromagnetic field in plasma aggravate the degradation process. The results about PP maximum tensile strength （Crbmax） confirm this conclusion. PP plastic heavily loses its extensibility, mechanical integrity and strength in a short time after suffering a synergetic treatment of the herb extract and air DBD plasma with no toxic residues left. The components of herb extract keep almost unchanged and may be reused. This study offers a new approach to manage and recycle typical plastics.
