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Four-wave mixing in CO via the C 1Σ+ (υ′=0) state

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Abstract

Coherent vacuum ultraviolet (VUV) radiation was generated by four-wave difference frequency mixing (ωVUV=2ω1−ω2) of pulsed dye laser radiation in carbon monoxide (CO). The frequency ω1 was tuned to the C 1Σ+(υ′=0)←X 1Σ+(υ″=0) two-photon transition, while the dye laser frequency ω2 was scaned around 17650 cm−1 which corresponds to the A 1Π(υ=7)«C 1Σ+(υ′=0) transition energy. The VUV intensity was found to be strongly wavelength dependent. The analysis of the spectrum revealed (i) that the VUV intensity was enhanced by the rotational levels of the A 1Π(υ=7) state and (ii) that the off-resonance excitation in the C 1Σ+(υ′=0)←X 1Σ+(υ″=0) two-photon transition greatly contributed to the present four-wave mixing process. The effects of pumping laser detuning, saturation and foreign gases are briefly discussed.

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Authors and Affiliations

  1. RIKEN, The Institute of Physical and Chemical Research, 2-1, Hirosawa, Wako, 351-01, Saitama, Japan

    K. Tsukiyama, M. Tsukakoshi & T. Kasuya

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  1. K. Tsukiyama
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  2. M. Tsukakoshi
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  3. T. Kasuya
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Tsukiyama, K., Tsukakoshi, M. & Kasuya, T. Four-wave mixing in CO via the C 1Σ+ (υ′=0) state. Appl. Phys. B 50, 23–28 (1990). https://doi.org/10.1007/BF00330088

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