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Electron Microscopy and Nanostructure Group

Facilities - JEM-ARM200CF

A New-York-state-owned state-of-the-art electron microscope, JEOL ARM200, which was delivered at the end of 2011, and commissioned in June 2013. It is equipped with a cold FEG electron source, two aberration correctors, a Gatan-Quantum electron-energy-loss spectrometer with dual acquisition capabilities, and a SDD x-ray detector. A precession camera was installed in Aug. 2013 for quantitative diffraction measurements.


A special custom-made 200kV FEG TEM that was installed in 2004. Its key feature is the long–focal length objective lens, allowing magnetic measurements at a residual field below 0.4mT with a lattice resolution of 0.5nm. It is the first of its kind in the US. This microscope was also designed for high-resolution holography of magnetic materials providing fine hologram fringe spacing and high fringe contrast. A home-built Hole-Free Phase Plate for magnetic imaging was developed and installed in May 2013.


A JEOL 300kV FEG analytical TEM with scanning capabilities that was installed in 1997. It is equipped with a Gatan Image Filter, a Thermal Noran EDX detector, and a biprism for holography. The magnetic field at the sample area as a function of the objective lens potential is well calibrated for magnetic experiments.

Ultrafast Electron Diffraction (UED) system

The pump-probe based UED system was constructed under the BNL LDRD funding with support from the Source Development Lab at NSLS. The system has a 1.6 cell photocathode RF gun to produce 2 to 5 MeV electrons and a frequency tripped Ti: sapphire laser to generate femtosecond electron pulses. The electron beam diagnostics consists of a movable Faraday cup and a beam profile monitor. The sample chamber has 10 sample slots with cryo-capability and is equipped with a x-y-Φ motorized manipulator. Four meters downstream of the diffraction chamber is the high efficiency detector, designed for high energy electrons. The instrument was commissioned in 2012, achievable of a temporal resolution of 100fs with 106 electrons per pulse. It is considered the best of its kind in the field.