All-Optical Three-Dimensional Electron Momentum Imaging

Orunesajo, Emmanuel; Basnayake, Gihan; Ranathunga, Yasashri; Stewart, Gabriel; Heathcote, David; Vallance, Claire; Lee, Suk Kyoung; Li, Wen

doi:10.1021/acs.jpca.1c03445

Cited by 5 publications

(3 citation statements)

References 22 publications

(40 reference statements)

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“…A fast silicon photomultiplier (Si-PM) was also adopted. The achieved time resolution was similar to that of MCP pick-off but deadtime was further reduced to an unprecedented 0.48 ns [75].…”

Section: Pmt or Mcp Pick-off Of Timing Signalsmentioning

confidence: 76%

“…The correlation of camera spot intensity and the digitizer peak amplitude from the Si-PM for two electron events. Reprinted with permission from [75]. Copyright (2021) American Chemical Society.…”

Section: System Performance Characterization and Methods Validationmentioning

confidence: 99%

“…Further reduction of the deadtime was achieved recently by adopting a dye-based fast scintillator and a fast silicon photomultiplier (siPMT) [75] (figure 12). In this case, the siPMT provided ringing-free waveforms with a rise time of 1.2 ns and a FWHM of 2.7 ns.…”

Section: Multi-hit Performancementioning

confidence: 99%

See 2 more Smart Citations

Three-dimensional (3D) velocity map imaging: from technique to application

Basnayake¹,

Ranathunga²,

Lee³

et al. 2022

J. Phys. B: At. Mol. Opt. Phys.

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The velocity map imaging (VMI) technique was first introduced by Eppink and Parker in 1997, as an improvement to the original ion imaging method by Houston and Chandler in 1987. The method has gained huge popularity over the past two decades and has become a standard tool for measuring high-resolution translational energy and angular distributions of ions and electrons. VMI has evolved gradually from 2D momentum measurements to 3D measurements with various implementations and configurations. The most recent advancement has brought unprecedented 3D performance to the technique in terms of resolutions (both spatial and temporal), multi-hit capability as well as acquisition speed while maintaining many attractive attributes afforded by conventional VMI such as being simple, cost-effective, visually appealing and versatile. In this tutorial we will discuss many technical aspects of the recent advancement and its application in probing correlated chemical dynamics.

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Section: Pmt or Mcp Pick-off Of Timing Signalsmentioning

confidence: 76%

Section: System Performance Characterization and Methods Validationmentioning

confidence: 99%

See 1 more Smart Citation

Three-dimensional (3D) velocity map imaging: from technique to application

Basnayake¹,

Ranathunga²,

Lee³

et al. 2022

J. Phys. B: At. Mol. Opt. Phys.

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Time-stretched multi-hit 3D velocity map imaging of photoelectrons

Goudreau

Boguslavskiy

Moffatt

et al. 2023

Review of Scientific Instruments

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The 2D photoelectron velocity map imaging (VMI) technique is commonly employed in gas-phase molecular spectroscopy and dynamics investigations due to its ability to efficiently extract photoelectron spectra and angular distributions in a single experiment. However, the standard technique is limited to specific light-source polarization geometries. This has led to significant interest in the development of 3D VMI techniques, which are capable of measuring individual electron positions and arrival times, obtaining the full 3D distribution without the need for inversion, forward-convolution, or tomographic reconstruction approaches. Here, we present and demonstrate a novel time-stretched, 13-lens 3D VMI photoelectron spectrometer, which has sub-camera-pixel spatial resolution and 210 ps (σ) time-of-flight (TOF) resolution (currently limited by trigger jitter). We employ a kHz CMOS camera to image a standard 40 mm diameter microchannel plate (MCP)/phosphor anode detector (providing x and y positions), combined with a digitizer pick-off from the MCP anode to obtain the electron TOF. We present a detailed analysis of time-space correlation under data acquisition conditions which generate multiple electrons per laser shot, and demonstrate a major advantage of this time-stretched 3D VMI approach: that the greater spread in electron TOFs permits for an accurate time- and position-stamping of up to six electrons per laser shot at a 1 kHz repetition rate.

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Slicing Newton spheres with a two-camera 3D imaging system

Ranathunga,

Olowolafe,

Orunesajo

et al. 2023

The Journal of Chemical Physics

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We demonstrate a simple approach to achieve three-dimensional ion momentum imaging. The method employs two complementary metal–oxide–semiconductor cameras in addition to a standard microchannel plates/phosphor screen imaging detector. The two cameras are timed to measure the decay of luminescence excited by ion hits to extract the time of flight. The achieved time resolution is better than 10 ns, which is mainly limited by camera jitters. A better than 5 ns resolution can be achieved when the jitter is suppressed.

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All-Optical Three-Dimensional Electron Momentum Imaging

Cited by 5 publications

References 22 publications

Three-dimensional (3D) velocity map imaging: from technique to application

Three-dimensional (3D) velocity map imaging: from technique to application

Time-stretched multi-hit 3D velocity map imaging of photoelectrons

Slicing Newton spheres with a two-camera 3D imaging system

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