2019 Physics/Theoretical Colloquium

 

Thursday, November 14th , 2019

3:45 – 4:45 p.m.

Rosen Auditorium (TA-53, Bldg. 001)

 

 

Refreshments at 3:15pm

 

Speaker: Dr. Laurent Nahon 

Synchrotron SOLEIL 

 

“Inside DESIRS: exploring instrumental aspects of a   VUV beamline @ SOLEIL  ”

 

 

Abstract: 

 

DESIRS is an undulator-based VUV (5-40 eV) beamline at synchrotron SOLEIL (2.75 GeV) featuring high flux, high resolution and fully variable and calibrated polarization.(1) Its scientific case is mainly focused into the study of neutral and ion spectroscopy, fragmentation, reactivity, photoionization dynamics and various types of circular dichroism on isolated species - from atoms, to cold molecules, chiral molecules, radicals, clusters, large biopolymers and nanoparticles - relevant to physics, chemistry, biology, astrophysics and planetary science.

After an introduction to Synchrotron radiation in general and of DESIRS scientific case, instrumental aspects of the beamline and its associated permanent end stations will be described, including:

    a unique wavefront-division based Fourier-Transform spectrometer (2, 3) for absorption spectroscopy, on closed- and open-shell systems, reaching the unprecedented resolving power of 106 .

 

    a molecular beam chamber (4) coupled to a double imaging electron/ion coincidence spectrometer (i2PEPICO) (5), allowing to study the photoionization and fragmentation dynamics over a wide range of gas phase targets.

 

 

1.             L. Nahon, N. de Oliveira, G. Garcia, J. F. Gil, B. Pilette, O. Marcouille, B. Lagarde, F. Polack, DESIRS : a state-of-the-art VUV beamline featuring high resolution and variable polarization for spectroscopy  and dichroism at SOLEIL J. Synchrotron Rad. 19, 508-520 (2012). See also https://www.synchrotron-soleil.fr/en/beamlines/desirs

2.             N. de Oliveira, M. Roudjane, D. Joyeux, D. Phalippou, J. C. Rodier, L. Nahon, High resolution broadband  Fourier transform absorption spectroscopy in the VUV range  Nature Photonics 5, 149-153 (2011).

3.             N. de Oliveira, D. Joyeux, M. Roudjane, J.-F. Gil, B. Pilette, L. Archer, K. Ito, L. Nahon, The high-resolution absorption spectroscopy branch on the VUV beamline DESIRS at SOLEIL. J. Synchrot. Radiat. 23, 887-900 (2016)10.1107/S1600577516006135).

4.             X. Tang, G. Garcia, J.-F. Gil, L. Nahon, Vacuum upgrade and enhanced performances of the double imaging electron/ion coincidence end-station at the vacuum ultra-violet beamline DESIRS. Rev. Sci. Inst. 86, 123108 (2015).

5.             G. Garcia, B. Cunha de Miranda, M. Tia, S. Daly, L. Nahon, DELICIOUS III: a multipurpose double imaging particle coincidence spectrometer for gas phase vacuum ultra-violet photodynamics studies. Rev. Sci. Inst. 84, 053112 (2013).