Note: An improved 3D imaging system for electron-electron coincidence measurements

Lin, Yun Fei; Lee, Suk Kyoung; Adhikari, Pradip; Herath, Thushani N.; Lingenfelter, Steven; Winney, Alexander H.; Li, Wen

doi:10.1063/1.4931684

Cited by 25 publications

(21 citation statements)

References 13 publications

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“…52 for discussion of multi-hit delay-line anodes for VMI, the works of Li and co-workers for the use of fast frame cameras in conjunction with a high-speed digitizers, [53][54][55] and Vallance et al for general discussion of fast sensors for VMI. 25 In terms of probing ultrafast molecular dynamics in polyatomic molecules, the capabilities and benefits of multi-mass ion imaging are clear.…”

Section: Discussionmentioning

confidence: 99%

Time-resolved multi-mass ion imaging: Femtosecond UV-VUV pump-probe spectroscopy with the PImMS camera

Forbes

Makhija

Veyrinas

et al. 2017

The Journal of Chemical Physics

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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 CFI photolysis are presented. The experiments utilized femtosecond VUV and UV (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 indicate 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.

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Section: Discussionmentioning

confidence: 99%

Time-resolved multi-mass ion imaging: Femtosecond UV-VUV pump-probe spectroscopy with the PImMS camera

Forbes

Makhija

Veyrinas

et al. 2017

The Journal of Chemical Physics

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“…This limit has now been removed with the development of a new type of 3D imaging system, which features a camera and a waveform digitizer 24,25 . The physical dead-time is well under one nanosecond and a zero dead-time detection has also been achieved 26 . When this new imaging system is combined with the principle of angular streaking, a relative time delay of ionization ranging from tens of attoseconds to more than one femtosecond can be accessed, thus enabling a true attosecond pump-probe method, in which the pump step is the first ionization while the probe is the second ionization.…”

Section: Figure 1 (A)mentioning

confidence: 97%

Attosecond Electron Correlation Dynamics in Double Ionization of Benzene Probed with Two-Electron Angular Streaking

et al. 2017

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With a novel three-dimensional electron-electron coincidence imaging technique and two-electron angular streaking method, we show that the emission time delay between two electrons can be measured from tens of attoseconds to more than 1 fs. Surprisingly, in benzene, the double ionization rate decays as the time delay between the first and second electron emission increases during the first 500 as. This is further supported by the decay of the Coulomb repulsion in the direction perpendicular to the laser polarization. This result reveals that laser-induced electron correlation plays a major role in strong field double ionization of benzene driven by a nearly circularly polarized field.

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“…We could employ the quadrupole coincidence (ion-ion-electronelectron) because the current method is capable of highly efficient detection of two electrons. 37 However, two-electron measurements do not provide further insight into the scope of this study while they require a much longer acquisition time. Therefore, we will focus on the triple coincidence data (Figure 4).…”

Section: Double Ionization and Dissociation Dynamics Of Pennamentioning

confidence: 99%

A new electron-ion coincidence 3D momentum-imaging method and its application in probing strong field dynamics of 2-phenylethyl-N, N-dimethylamine

Fan

Lee

et al. 2017

The Journal of Chemical Physics

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We report the development of a new three-dimensional (3D) momentum-imaging setup based on conventional velocity map imaging to achieve the coincidence measurement of photoelectrons and photo-ions. This setup uses only one imaging detector (microchannel plates (MCP)/phosphor screen) but the voltages on electrodes are pulsed to push both electrons and ions toward the same detector. The ion-electron coincidence is achieved using two cameras to capture images of ions and electrons separately. The time-of-flight of ions and electrons are read out from MCP using a digitizer. We demonstrate this new system by studying the dissociative single and double ionization of PENNA (2-phenylethyl-N,N-dimethylamine). We further show that the camera-based 3D imaging system can operate at 10 kHz repetition rate.

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Note: An improved 3D imaging system for electron-electron coincidence measurements

Cited by 25 publications

References 13 publications

Time-resolved multi-mass ion imaging: Femtosecond UV-VUV pump-probe spectroscopy with the PImMS camera

Time-resolved multi-mass ion imaging: Femtosecond UV-VUV pump-probe spectroscopy with the PImMS camera

Attosecond Electron Correlation Dynamics in Double Ionization of Benzene Probed with Two-Electron Angular Streaking

A new electron-ion coincidence 3D momentum-imaging method and its application in probing strong field dynamics of 2-phenylethyl-N, N-dimethylamine

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