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다음주 수요일(12월 30일) 세미나가 진행됩니다.

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제 목 : Developing a new ultrafast proving tool : challenging the chemical- and electronic dynamics of energy storage and solar cell systems

연 사 : 서현욱 박사 (Centre for Free-Electron Laser Science)

일 시 : 2015년 12월 30일 (수) 오전 11시

장 소 : 화학관 세미나실 (330226호실)

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Developing a new ultrafast proving tool : challenging the chemical- and electronic dynamics of energy storage and solar cell systems

Laser based VUV pulses produced via the High Harmonic Generation process (HHG) by table-top systems enabled access to VUV and soft X-ray photon energies in the laboratory. In addition, ultrashort pulse duration downs to the attosecond scale opened new possibilities in many scientific research fields of physics and chemistry. Here our newly developed HHG-driven time- and angle- resolved PES set-up will be presented. The new machine is based on an apertureless time-of-flight electron spectrometer and a femto-second table-top laser light source. The spectrometer is equipped with supplemental pumping ports to extend the operational pressure up to 10-4 mbar range.

Recently, we have studied the HHG from the gas-filled waveguide when using mixtures of two rare gases (Ar and Ne) as a nonlinear gas medium. The admixing of Ne into Ar gas can improve the generation yields of harmonics under slight phase mismatching conditions by a factor of 2. It is attributed to an improvement of the phase matching in the gas mixture. Together with our new experimental set-up, our new observation on the improved efficiency of HHG process by using two rare gas mixtures will be presented.