Two-photon (vacuum ultraviolet + visible) spectroscopy of argon, krypton, xenon, and molecular hydrogen
Two-photon transitions have been examined in argon, krypton, xenon, and molecular hydrogen using a coherent vacuum ultraviolet (VUV) photon at a fixed wavelength of 118 nm and a tunable photon from a dye laser. The 118 nm VUV photon is produced by third harmonic generation in xenon using UV light at 355 nm from a frequency tripled Nd:YAG laser. Though the VUV intensity is very weak, (approx.100 nJ per pulse) it was utilized very efficiently since most of VUV photons in the ionization region were absorbed. Spectra were obtained in the region of 12.5 to 13.5 eV and the corresponding two-photon rate constants were calculated. This is the first time that coherent VUV light has been employed with tunable visible light for the production of two-photon spectra and the measurement of two-photon rates. The two-photon ionization rate of xenon was measured using photons at fixed wavelengths of 118 and 355 nm. A new parameter is proposed for direct comparison of the data from various two-photon experiments.
- Research Organization:
- Chemical Physics Section, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6378
- OSTI ID:
- 6779527
- Journal Information:
- J. Chem. Phys.; (United States), Journal Name: J. Chem. Phys.; (United States) Vol. 89:9; ISSN JCPSA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400201* -- Chemical & Physicochemical Properties
ABSORPTION SPECTRA
ARGON
ELECTROMAGNETIC RADIATION
ELEMENTS
EXTREME ULTRAVIOLET RADIATION
FLUIDS
GASES
HYDROGEN
IONIZATION
KRYPTON
LASER SPECTROSCOPY
MULTI-PHOTON PROCESSES
NONMETALS
PHOTOIONIZATION
RADIATIONS
RARE GASES
SPECTRA
SPECTROSCOPY
ULTRAVIOLET RADIATION
VISIBLE RADIATION
XENON