Simultaneous detection of atomic and molecular hydrogen using a tunable ArF excimer laser

✍ Scribed by A. D. Sappey; D. J. Funk

• Publisher: Springer
• Year: 1993
• Tongue: English
• Weight: 801 KB
• Volume: 56
• Category: Article
• ISSN: 0721-7269
• DOI: 10.1007/bf00348630

✦ Synopsis

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 D 2 (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 1220+ ~ X 1Z'o+(2,0 ) band. Fluorescence occurs at 750 nm and 830 nm on the (E 1£.g+ ~ B 122,+) transitions.