18th Annual SEUFC Poster Presentation

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    17-Jul-2015
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Transcript of 18th Annual SEUFC Poster Presentation

  • A Wavelength Dependent Investigation of the 1* and 1* States in Indole via Photoionization and Fragmentation Pump-Probe Spectroscopy

    T. J. GODFREY, Hui Yu, Michael S. Biddle, and Susanne UllrichDepartment of Physics and Astronomy, Physics Building, University of Georgia, Athens, GA 30602

    E-mail: [email protected]; [email protected]

    TR-PES

    EXPERIMENT

    TR-IY: Indole probed with 294 nm photons. Mass and excited-state fragmentation

    information aids in TR-KER and TR-PES analysis.

    TR-KER: H-atoms probed at 243.15 nm. Detects H-atoms using magnetic bottle

    spectrometer. Time-of-flight (TOF) measurements are

    converted to H-atom kinetic energy. Provides indirect analysis of 1* state.

    TR-PES: Indole probed with 294 nm photons. Photoelectron signal is deconvoluted

    using a Levenberg-Marquardt optimi-zation algorithm.

    Provides direct analysis of all excitedstates in relaxation process.

    TOF measurements converted to photo-electron kinetic energy with 1,3-buta-diene and ammonia.

    CONCLUSIONS REFERENCES

    GENERAL: Molecular beam generated by heating

    indole to 35 C. Indole vapor carried byhelium gas.

    Indole pumped at wavelengths in the241-273 nm range.

    TR-KER

    m/z = 117

    m/z = 116

    pu(nm)

    pr(nm)

    1La-State Activity

    1Lb-State Activity

    1*-State Activity

    200[1] 243.15 - - 100 30 fs201[2] 294