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Optics Communications

Four-photon pressure-induced ionization of Xe by 351-nm radiation

M. Rothschild, J. Zavelovich, W. Gornik, C. K. Rhodes

Published Nov 1, 1981• 4 citations
Publisher
DOI
10.1016/0030-4018(81)90099-7

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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.
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.