This paper proposes a novel one-colour Xe-Kr laser induced collisional ionization system. Considering the level scheme of the system, it finds that the initial state of the reaction--the four 4f levels with even J of ...This paper proposes a novel one-colour Xe-Kr laser induced collisional ionization system. Considering the level scheme of the system, it finds that the initial state of the reaction--the four 4f levels with even J of Xe-can be prepared through method of four-photon resonant excitation by dye laser with wavelength of -440 nm. Absorption of an additional photon （the transfer laser） of the same wavelength will complete the laser induced collisional ionization process. The resonance enhanced ionization spectrum of Xe by four laser photons at -440nm is measured through time-of-flight mass spectrometry, this aims at the preparation of the initial state of the system proposed. The Stark broadening of the measured spectrum is observed and consistent with the previous study. Analysis of the measured resonance ionization spectrum implies the feasibility of -440 nm four-photon resonant excitation of the initial 4f state of the Xe Kr system proposed in this paper, which prepares for a further experiment of laser induced collisional ionization.展开更多
一个计划为经由堕落拉曼相互作用产生一个四光子的协调状态被介绍。计划不需要古典地操作原子。Itsanother 优点是原子自发的排放能被忽视。因此，系统的连贯可以更好被维持。计划能被概括产生 2 ~ n 的重叠 2 ~ n 的协调状态和重叠二...一个计划为经由堕落拉曼相互作用产生一个四光子的协调状态被介绍。计划不需要古典地操作原子。Itsanother 优点是原子自发的排放能被忽视。因此，系统的连贯可以更好被维持。计划能被概括产生 2 ~ n 的重叠 2 ~ n 的协调状态和重叠二模式的协调状态。在每个模式的协调状态相称性地在一个圆上。展开更多
We present a theory for quantum interference of four photons generated by spontaneous parametric downconversion. Detailed investigation of the dependence of fourfold coincidence count rate on time delay between the in...We present a theory for quantum interference of four photons generated by spontaneous parametric downconversion. Detailed investigation of the dependence of fourfold coincidence count rate on time delay between the incident and the reflective pump laser pulses is carried out. Gaussian type dependence is found, and good agreement between our theoretical results and experimental data reported in the literature is achieved.展开更多
It is found that the 330 nm signal of parametric four- wave mixing is the strongest when the pressure of argon is 1 500Pa in the sodium vapor with a passme of 266Pa.
基金Project supported by the National Natural Science Foundation of China (Grant Nos 10674036 and 10774033)Program for New Century Excellent Talents in UniversityProgram of Excellent Team in Harbin Institute of Technology
文摘This paper proposes a novel one-colour Xe-Kr laser induced collisional ionization system. Considering the level scheme of the system, it finds that the initial state of the reaction--the four 4f levels with even J of Xe-can be prepared through method of four-photon resonant excitation by dye laser with wavelength of -440 nm. Absorption of an additional photon （the transfer laser） of the same wavelength will complete the laser induced collisional ionization process. The resonance enhanced ionization spectrum of Xe by four laser photons at -440nm is measured through time-of-flight mass spectrometry, this aims at the preparation of the initial state of the system proposed. The Stark broadening of the measured spectrum is observed and consistent with the previous study. Analysis of the measured resonance ionization spectrum implies the feasibility of -440 nm four-photon resonant excitation of the initial 4f state of the Xe Kr system proposed in this paper, which prepares for a further experiment of laser induced collisional ionization.
文摘We present a theory for quantum interference of four photons generated by spontaneous parametric downconversion. Detailed investigation of the dependence of fourfold coincidence count rate on time delay between the incident and the reflective pump laser pulses is carried out. Gaussian type dependence is found, and good agreement between our theoretical results and experimental data reported in the literature is achieved.
文摘It is found that the 330 nm signal of parametric four- wave mixing is the strongest when the pressure of argon is 1 500Pa in the sodium vapor with a passme of 266Pa.
