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A novel and efficient excitation- and ionization-scheme for laser resonance ionization of mercury

Alexey A Podshivalov, Oleg I. Matveev, Benjamin W. Smith +1 more

Spectrochimica Acta Part B Atomic SpectroscopyDec 1, 19998 citations

Two-dimensional resonance ionization imaging with a low pressure mercury atom vapor cell

Oleg I. Matveev, Benjamin W. Smith, James D. Winefordner

Optics CommunicationsNov 1, 19987 citations

Measurement of the Effective Cross Section for the Ionization of Cesium by Excited Mercury Atoms Using the Method of Resonance Fluorescence Quenching

A. T. Voronchev, Andrey Mikhailov, V. L. Fedorov

Optics and SpectroscopyOct 1, 19692 citations

Resonance-ionization detection of photons of sodium atoms in an argon atmosphere

Oleg I. Matveev, V. A. Pribytkov

Journal of Applied SpectroscopyJan 1, 19871 citation

RESONANCE IONIZATION DETECTION OF MERCURY PHOTONS. II: SPECTRAL CHARACTERISTICS AND QUANTUM EFFICIENCY

Alexander A. Ganeev, Oleg I. Matveev, S. E. Sholupov +2 more

Optics and SpectroscopyAug 1, 19940 citations

Investigations of resonantly enhanced multiphoton ionizations of atomic mercury and potassium

Kelly Robert Lim Mah

Two investigations are reported on the application of resonantly enhanced multiphoton ionization (RMPI) to gaseous mixtures of an atomic vapor and a few Torr of argon. Photon fluxes large enough to ionize atoms by RMPI were produced by focussing down the light from a tunable pulsed dye laser. The irradiances generated were of the order of 500MWcm⁻². Ionization was detected by a voltage biased wire electrode that simply collected the photoelectrons either directly or after some gas multiplication. One investigation was the measurement of the dependence of RMPI processes in mercury on the polarization of the incident light for comparisons with theoretical calculations. The processes were four-photon resonant absorptions to either a ¹S₀ or ¹’³D₂ level followed by single photon ionization. Complete photoionization of all atoms excited to the resonant levels is established and the measured polarization dependences are found to agree with the calculated polarization dependence for the resonant excitation step of the RMPI process. Unexplained observations of the distortions in the polarization dependence of the ion yield and the absorption linewidth of the 6d ¹D₂ resonance are discussed. The second investigation was a study of the density dependent electric dipole forbidden two-photon resonant transition ²S → ²P in three-photon RMPI spectra of the Rydberg states of potassium. Stark interactions are shown to be unlikely and too weak. From the characteristics of the spectra, the excitation process is identified as a laser-assisted collision interaction.Two investigations are reported on the application of resonantly enhanced multiphoton ionization (RMPI) to gaseous mixtures of an atomic vapor and a few Torr of argon. Photon fluxes large enough to ionize atoms by RMPI were produced by focussing down the light from a tunable pulsed dye laser. The irradiances generated were of the order of 500MWcm⁻². Ionization was detected by a voltage biased wire electrode that simply collected the photoelectrons either directly or after some gas multiplication. One investigation was the measurement of the dependence of RMPI processes in mercury on the polarization of the incident light for comparisons with theoretical calculations. The processes were four-photon resonant absorptions to either a ¹S₀ or ¹’³D₂ level followed by single photon ionization. Complete photoionization of all atoms excited to the resonant levels is established and the measured polarization dependences are found to agree with the calculated polarization dependence for the resonant excitation step of the RMPI process. Unexplained observations of the distortions in the polarization dependence of the ion yield and the absorption linewidth of the 6d ¹D₂ resonance are discussed. The second investigation was a study of the density dependent electric dipole forbidden two-photon resonant transition ²S → ²P in three-photon RMPI spectra of the Rydberg states of potassium. Stark interactions are shown to be unlikely and too weak. From the characteristics of the spectra, the excitation process is identified as a laser-assisted collision interaction.

Jan 1, 20100 citations

Resonance ionization detection of mercury photons. A study of ionization processes. I

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