Isabel @beamshift

making things happen with electron microscopes🔬 she/her 🐘: https://t.co/R0PzrAIen6 🦋: https://t.co/q3MDRCDW1D beamshift.net back focal plane (oregon) Joined March 2022

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Isabel @beamshift

6 days ago

@eigenlucy the lighting is so crisp 🤌

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Philip Turner @philipturnerar

a week ago

Atomic Resolution STM

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Isabel @beamshift

a week ago

@Spirit532_ awesome, looking forward to seeing where this goes!! put a SEM in every home!

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@CALVINGINEERING Congratulations, but keep in mind that an electron beam on a target causes x-ray emission and evaluate your radiation risk. Any commercial electron beam system with a window uses leaded glass. What accelerating voltage and current are you using?

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Isabel @beamshift

a week ago

@nelke_IGB yeah, thermo fisher EM is a direct descendant of Philips and I expect them to try to direct and capture any innovation on their platform, especially when it comes to cryo-EM where they already have ~90% of the market which is not ideal

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🌿 lithos @lithos_graphein

2 weeks ago

Kirin 9030 has bad dishing at M2. Only layer I see with this from @SemiAnalysis_ breakdown. The CDU also looks somehow off for this layer.

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Isabel @beamshift

2 weeks ago

@nelke_IGB It will probably be easier to commercialize a modification of the microscope column in only one location, instead of adding multiple elements in the optical path, so maybe that was a factor

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Isabel @beamshift

2 weeks ago

@nelke_IGB Oh that would work then, I’ve only seen chopping followed by pulse compression actually implemented in a TEM. If bunching affects the energy spread of the beam, that would need to be corrected before doing high resolution EM, but a monochromator would filter out some intensity

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Isabel @beamshift

2 weeks ago

@nelke_IGB I’m familiar with structured illumination in a TEM via nanofabricated apertures, and I see the advantage of a laser phase plate in not having any physical material to beam damage, but I didn’t expect the implementation to be “the brightest CW laser in the world”

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Isabel @beamshift

2 weeks ago

@nelke_IGB I’m thinking of a beam chopper below the cathode that deflects electrons into an aperture between pulses, so imaging current is a fraction of total beam current. With that and a pulsed laser phase plate you would still get the same contrast enhancement but lower signal

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Isabel @beamshift

2 weeks ago

@CALVINGINEERING @CR4163R You might look into machining a groove that you can compress the seal into. This has some info on tolerances for o-ring grooves cas.web.cern.ch/sites/default/…

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Isabel @beamshift

2 weeks ago

@CALVINGINEERING @CR4163R Also you want to avoid any silicone grease in a vacuum system with an electron beam, because you’ll get SiO2 deposition

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Mehdi @MehdiHacks

3 weeks ago

Reminder: protect the connectors on your precious RF tools and SDRs when you are not using them. Usually called dust caps, they are available for any type of connector you imagine.

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Isabel @beamshift

2 weeks ago

@fishPointer 3D or 2D?

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Anna Riedl @AnnaLeptikon

3 weeks ago

Lithography is the technology, that forces rocks to think by engraving runes.

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Inna Vishik @InnaVishik

3 weeks ago

In 1911, Heike Kamerlingh Onnes, by virtue of being the first person to liquify helium, serendipitously discovered that the resistance of mercury dropped to zero below 4.2K–the first superconductor. For the next decades, some of the luminaries of 20th century physics tackled the superconductivity problem, without achieving the holy grail of a microscopic theory about why it happens. It was not until two smoking gun experiments in the 1950s pointed in the correct direction: isotope effect experiments in mercury showed that the atomic lattice, not just electrons, were implicated, and low-temperature specific heat experiments gave evidence for a small energy gap associated with the superconducting state. These key experiments were among thousands of valid works about superconductivity, and certainly no one knew what would be the smoking gun experiment in 1911 or even in 1941 (the author of the isotope effect paper even stated that their motivation was that they had different isotopes of mercury laying around). With all the key observations in place, Bardeen, Cooper, and Shrieffer were able to formulate the BCS theory explaining what is now called the ‘conventional’ type of superconductivity. This history illustrates the important role of serendipity and path-dependence in superconductivity research (as well as other areas dealing with complex many-body systems). If Onnes chose to measure aluminum instead of mercury, he would not have discovered superconductivity when he did; if someone had tried to FAFO superconductivity in different isotopes of a metal earlier, the mechanism of superconductivity could have been established much sooner. Similarly if superconductivity was discovered in Ba1-xKxBiO3 (BKBO, Tc up to 34K) *before* it was discovered in La2-xBaxCuO4 (LBCO, Tc up to 35K, first cuprate discovered), humanity could have gone another generation without discovering cuprate superconductivity in excess of liquid nitrogen temperatures.

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max @shir0kawa

3 weeks ago

Anyone in nyc enjoy building things and want free gear? 3D printer kits, conflat vacuum chambers, lasers, optics, glassware, electronic test equipment etc . Morningside heights Manhattan dm me