Abstract
We report preliminary experiments which demonstrate the simultaneous detection of both atomic and molecular hydrogen using a single tunable ArF laser. The tunable ArF laser was modified to lase simultaneously at two wavelengths by the addition of a second grating to the oscillator stage as in earlier work by Ketterle et al. for KrF operation. To our knowledge, this is the first demonstration of dual-wavelength capability with a tunable ArF excimer. The H atom diagnostic utilized tunable ArF excimer laser output at 193.29 nm which was Raman shifted in D2 (first Stokes) to generate 205.14 nm radiation which then excited the H atom to its (3s, 3d) states via a two-photon transition. Fluorescence was detected at 656 nm on the (3s, 3d) → 2p transition. The second wavelength from the tunable excimer was used to excite several rovibronic LIF transitions of hydrogen molecule via two-photon absorption on the E 1Σ + g ⇐ X 1Σ + g (2,0) band. Fluorescence occurs at 750 nm and 830 nm on the (E 1Σ + g ⇒ B 1Σ + g ) transitions.
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Sappey, A.D., Funk, D.J. Simultaneous detection of atomic and molecular hydrogen using a tunable ArF excimer laser. Appl. Phys. B 56, 229–234 (1993). https://doi.org/10.1007/BF00348630
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DOI: https://doi.org/10.1007/BF00348630