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Citation: Zhang Gui-Qiu, Sha Guo-He, Xu Ji-Jun, Knott W.Proch D. Abnormal Pressure Effects of H₂ Three-photon Resonant Enhanced Ionization Spectroscopy[J]. Acta Physico-Chimica Sinica, ;1997, 13(07): 617-620. doi: 10.3866/PKU.WHXB19970708 shu

Abnormal Pressure Effects of H₂ Three-photon Resonant Enhanced Ionization Spectroscopy

1.
Dalian Institute of Chemical Physics,Chinese Academy of Sciences,Dalian 116023

Received Date: 19 November 1996
Available Online: 15 July 1997

The three-photon resonant ionization spectroscopy of H2 B1∑u+-X1∑g+ (12,0) and C1Ⅱu-X1∑g+ (2,0) exhibits abnormal pressure effects. Some of them are observed for the first time. Pressure-induced abnormal line shift, line broadening, line splitting and spectral intensity variations can be well explained by a mechanism of reabsorption of the third harmonic generation in the medium. Approximate expressions considering the phase matching requirement yield lineshifts, -splitting and -intensities at different pressures in od agreement with the experimental results. Two similar spectra are detected by two tandem electrode pairs in a gas celll which give experimental evidence for THG reabsorption mechanism. The failure to obtain ion signal from circularly polarized light also supports the above mechanism.
- Molecular hydrogen,
- Abnormal pressure effects,
- 3-Photon REMPI,
- Third harmonic generation
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Abnormal Pressure Effects of H2 Three-photon Resonant Enhanced Ionization Spectroscopy

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Abnormal Pressure Effects of H₂ Three-photon Resonant Enhanced Ionization Spectroscopy