Seminar by Prof. Martin SCHWELL: VUV spectroscopy of molecules of astrophysical and astrobiological interest
Thời gian: 14h ngày 17 tháng 8 năm 2018 (Thứ 6)
Địa điểm: Phòng họp Khoa Vật lý, 136 Xuân Thủy, Cầu Giấy, Hà Nội
Người trình bày: GS. Martin SCHWELL, Trường Đại học Paris-Est Creteil (UPEC), Pháp
I will focus on recent results obtained on molecules of astrophysical interest obtained with the DESIRS beamline at Synchrotron Soleil. We use the photoelectron photoion coincidence spectrometer DELICIOUS III which is permanent end station of this beamline. With this spectrometer we measure photoelectron spectra, photoion yield spectra and photoionization cross sections. Dissociative photoionization is also a particular interest of our work. Molecules will include C4H2, HC3N, C4N2, HCCCHO, CH3NC and others. I will also talk on results obtained for nucleic acid bases, compounds that we have been studying for their interest in astrobiology. The experimental results are analyzed using quantum chemical calculations.
In the last years we have also developed the measurement of VUV absorption cross sections at high temperatures. This work was triggered by the need to develop realistic models for hot planetary atmospheres. I will present recent results on NH3 and HCN in this frame.
As a conclusion I will present possible future perspectives for VUV spectroscopy of astrophysical molecules.