1. Studies of Molecular Photoruptures by using 2 Dimension (2+1) and (3+1) REMPI-TOF Jingming Long 15/09/2010

2. About project WHY WHAT High Energy Rydberg States of Molecules; Spectroscopy and Photofragmentation processes; A fundamental role in various photochemical and photophysical processes, and so on Resonance Enhanced Multiphoton Ionization –Time of Flight (REMPI-TOF) ---2D (2+1) REMPI, (3+1)REMPI REMPI-current (University of Iceland,Iceland) HOW Synchrotron studies (Paul Sherrer Institute, Switzerland) Two color, Nanosecond(UV/Vis) + Femtosecond(IR) experiment (University of Bergen,Norway)

3. About project CONDITION Excimer(308nm XeCl) Dye Laser( Lambda Physik) SHG, Sirah, Vaccum chambe Diffusion pump, turbo pump Lecroy oscilloscope 400MHz/2.5GS/S and so on Instruments: Prof. Agust Kvaran Dr. Victor Huasheng Wang Ph.D student Kristján Matthíasson Group: Collaborators:Professors J.P. Hansen and F. Øyvind, University of Bergen Dr. Erik Horsdal, University of Aarhus and so on

4. Experimental equipment

6. Sketch of the experimental setup to perform two-color experiments University of Bergen

7. Main research compounds i) Hydrogen halides (HX; X = Cl, Br, I) ii) Halogens, X 2 and interhalogens XY; X,Y = Cl, Br, I, X ≠ Y iii) Freons, CF n X m ; X = Cl, Br, I.

8. Typical 2D REMPI-TOF graph 2h 1h

9. Summarization of the first half year of 2010 Old Dye LaserNew Dye Laser PDREMPIPDREMPI Tektronix ×××× Lecroy ×××× PD: Power Dependent Old dye laser: Lumonics New dye laser: Scanmate Pro

10. Parts of LabVIEW programs

11. Different horizontal resolution at the same vertical resolution for mass spectrum 500 Pnts 10 000 Pnts 50 000 Pnts1000 Pnts After next trigger What’s its value??

12. Different vertical resolution at the same horizontal resolution for mass spectrum Vertical resolution:1/65536 Vertical resolution:1/256

13. Example---HCl mass spectrum Old data New data

14. Improvement What’s the meaning? More work for data processing? Larger file size? Higher resolution? More time? NO YES NO YES OldNew Manual Automatic 0~255/1Byte 500pnts 0~65535/2Byte Max 50000pnts At 2us More than 2s Transmitted time Less than 1s 500*1*(100 cm -1 /0.1cm -1 ) Byte 50000*2*(100 cm -1 /0.1cm -1 ) Byte Larger uncertain, Mass spectrum overlap Weaker background of spectra? YES Smoothness

15. Plan for the latter half year of 2010 Perform the experiment of 2D (3+1) REMPI-TOF of HCl Try to obtain the unexplored REMPI spectra of High Rydberg states Then analyze, make assignments… If everything goes well, prepare to write relevant academic papers. Work with Kari to finish the measurement and analysis of (2+1) REMPI experiment of CF 3 Br

16. Plan for the latter half year of 2010 To design and finish a Igor pro “toolkit” contains a series of procedures to Process REMPI-TOF experimental data, perform simulations and so on, which can be shared by our group easily. For example, the procedures we has finished, REMPI IntegrateV2.2,Mass IdentifyV1.0. During this period To optimize the REMPI-TOF LabVIEW program. Make it easy to operate and also be used in teaching of undergraduate experiment.