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LASER-INDUCED COLLISIONAL THREE-PHOTON IONIZATION IN A POTASSIUM-SODIUM MIXTURE

Sun Tao-Heng, Qin Liu

Jul 18, 19880 citations

Xe–Kr laser induced collisional ionization system and experimental preparation of its initial state: Four-photon resonant excitation

Hongying Zhang, Zhenzhong Lu, Fan Rong-Wei +1 more

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 ∼440 nm 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.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 ∼440 nm 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.

Chinese Physics BDec 1, 20083 citations

Resonant Multiphoton Ionization by Short Laser Pulses

Andre Charles Adler

Jan 1, 19930 citations

Experimental preparation of the initial state of Xe+-N laser-induced collisional charge transfer system: Multi-photon resonant ionization of xenon

Hongying Zhang, Zhenzhong Lu, Rongwei Fan +1 more

A novel one-color Xe + -N laser induced collisional charge transfer system is proposed, and preparation of the initial state of the system, i.e., Xe + is experimentally implemented through resonance enhanced multi-photon ionization (REMPI) by ∼440 nm dye laser. The REMPI of Xe is experimentally investigated through time-of-flight (TOF) mass spectrometry and the intensity dependence of Xe + is obtained, aiming at the preparation of Xe + . The resonant ionization spectra of Xe at ∼440 nm under several different conditions are measured, showing the impacts of mode purification and source pressure on the resonant ionization spectrum. The results indicate the feasibility of preparing the initial state of the Xe + -N system by ∼440 nm multi-photon resonant ionization, which prepares for a further experiment of laser-induced collisional charge transfer.A novel one-color Xe + -N laser induced collisional charge transfer system is proposed, and preparation of the initial state of the system, i.e., Xe + is experimentally implemented through resonance enhanced multi-photon ionization (REMPI) by ∼440 nm dye laser. The REMPI of Xe is experimentally investigated through time-of-flight (TOF) mass spectrometry and the intensity dependence of Xe + is obtained, aiming at the preparation of Xe + . The resonant ionization spectra of Xe at ∼440 nm under several different conditions are measured, showing the impacts of mode purification and source pressure on the resonant ionization spectrum. The results indicate the feasibility of preparing the initial state of the Xe + -N system by ∼440 nm multi-photon resonant ionization, which prepares for a further experiment of laser-induced collisional charge transfer.

Laser PhysicsMay 1, 20093 citations

Observation of laser-induced collisional energy transfer in xenon–argon mixtures

W. R. Garrett, S. Henderson, M. G. Payne

By using a multiphoton ionization technique, we observed a laser-induced energy-transfer process of fifth order in Xe–Ar atoms. Through four-photon excitation of the 4f[5/2]J = 2 level of Xe in collision with a ground-state Ar atom and the absorption of one additional photon, the 5s[3/2]J = 1 level of Ar is excited and subsequently ionized. By coincidence the same photon energy required for four-photon excitation of the chosen state in Xe is also adequate for absorption by Ar during the Xe*–Ar collision, thus permitting observation of a fifth-order laser-induced energy transfer in a simple one-color experiment.By using a multiphoton ionization technique, we observed a laser-induced energy-transfer process of fifth order in Xe–Ar atoms. Through four-photon excitation of the 4f[5/2]J = 2 level of Xe in collision with a ground-state Ar atom and the absorption of one additional photon, the 5s[3/2]J = 1 level of Ar is excited and subsequently ionized. By coincidence the same photon energy required for four-photon excitation of the chosen state in Xe is also adequate for absorption by Ar during the Xe*–Ar collision, thus permitting observation of a fifth-order laser-induced energy transfer in a simple one-color experiment.

Journal of the Optical Society of America BFeb 1, 19874 citations

Collisional Ionization of Xe Atoms in Single High Rydberg States

W.P. West, Terri Cook, Colin J. Latimer +2 more

peacJan 1, 19750 citations

Xe-Kr laser induced collisional ionization system and experimental preparation of its initial state： Four-photon resonant excitation

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