linkedin post 2022-06-28 04:03:34

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MASSIVE DISRUPTION. “The Great Oxidation Event (GOE) was a time interval when the Earth's atmosphere and the shallow ocean first experienced a rise in the amount of oxygen. This occurred approximately 2.4–2.0 Ga (billion years ago). The sudden injection of toxic oxygen into an anaerobic biosphere caused the extinction of many existing anaerobic species on Earth. The event is inferred to have constituted a mass extinction.” https://en.m.wikipedia.org/wiki/Great_Oxidation_Event View in LinkedIn
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linkedin post 2022-06-28 04:01:01

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PHOTOELECTRON SPEEDS. “In 1918 a Harvard University researcher, Mang-Fuh Hu in the first XPS paper reported, “some preliminary results in a determination of the maximum emission velocity of the photoelectrons from metals at X-ray frequencies”.” (XPS = X-ray photoelectron spectroscopy). https://lnkd.in/eDZvjevE View in LinkedIn
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linkedin post 2022-06-28 03:57:44

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EXPANDED OBSERVATIONS. “Two years after Einstein's publication, in 1907, P.D. Innes, a PhD student at that time, experimented with a Röntgen tube, Helmholtz coils, a magnetic field hemisphere (an electron kinetic energy analyser), and photographic plates, to record broad bands of emitted electrons as a function of velocity, in effect recording the first XPS spectrum.” (XPS = X-ray photoelectron spectroscopy). https://lnkd.in/eDZvjevE View in LinkedIn
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