Time-resolved multi-mass ion imaging: Femtosecond UV-VUV pump-probe spectroscopy with the PImMS camera
| Autor: | Albert Stolow, Paul Hockett, Kévin Veyrinas, Mark Brouard, Michael Burt, Varun Makhija, Claire Vallance, Iain Wilkinson, Rune Lausten, Jongmin Lee, Ruaridh Forbes |
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| Rok vydání: | 2017 |
| Předmět: |
Chemical Physics (physics.chem-ph)
Materials science 010304 chemical physics Polyatomic ion General Physics and Astronomy FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology Mass spectrometry Laser 01 natural sciences law.invention Imaging spectroscopy Ultraviolet light Time resolved spectroscopy Cameras Image sensors Time of flight mass spectrometry law Ionization Physics - Chemical Physics 0103 physical sciences Femtosecond Physical and Theoretical Chemistry Atomic physics 0210 nano-technology Spectroscopy Ultrashort pulse |
| Zdroj: | The Journal of chemical physics. 147(1) |
| ISSN: | 1089-7690 |
| Popis: | The Pixel-Imaging Mass Spectrometry (PImMS) camera allows for 3D charged particle imaging measurements, in which the particle time-of-flight is recorded along with $(x,y)$ position. Coupling the PImMS camera to an ultrafast pump-probe velocity-map imaging spectroscopy apparatus therefore provides a route to time-resolved multi-mass ion imaging, with both high count rates and large dynamic range, thus allowing for rapid measurements of complex photofragmentation dynamics. Furthermore, the use of vacuum ultraviolet wavelengths for the probe pulse allows for an enhanced observation window for the study of excited state molecular dynamics in small polyatomic molecules having relatively high ionization potentials. Herein, preliminary time-resolved multi-mass imaging results from C$_2$F$_3$I photolysis are presented. The experiments utilized femtosecond UV and VUV (160.8~nm and 267~nm) pump and probe laser pulses in order to demonstrate and explore this new time-resolved experimental ion imaging configuration. The data indicates the depth and power of this measurement modality, with a range of photofragments readily observed, and many indications of complex underlying wavepacket dynamics on the excited state(s) prepared. |
| Databáze: | OpenAIRE |
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