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A B Al-impurity centre Ti-impurity centre Relative ESR-signalintensity Magnetic field [Gauss] Principle of Electron Spin Resonance dating A = rotating electron creates a magnetic moment B = resonance occurs after microwave absorption C = the absorbed microwave is transformed into an ESR-signal by the spectrometer. At the Geography Department in Cologne, the newest spectrometer by Bruker, the Elexys 500 spectrometer (X-band), is at use.
Electron spin resonance dating was first introduced to the science community in 1975, when Motoji Ikeya dated a speleothem in Akiyoshi Cave, Japan.
Archeozoic: end of Azoic to 2,500,000,000 years ago: The era of the earliest living beings on earth.
"More than 3.5 billion years ago, small single-celled organisms acquired the capacity to photosynthesize" "Plants were restricted to the aquatic world until three billion years later, the first uncontroversial evidence for life is found 2,700,000,000 years ago.
Mesoproterozoic from 1,600,000,000 to 1,000,000,000 years ago. Particular importance attaches to occurred around 1,300,000,000 years ago during the late Mesoproterzoic era, after the earth's transition to a more highly oxygenated atmosphere with an ozone screen. Deposits that made Westmorland Green slate formed around 450 million years ago. About 50 million years later, the material was altered by heat and pressure (metamorphosed) to slate, during mountain-building. After many more millions of years, they resembled patches of moss a few centimeters high.
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Electron spin resonance dating can be described as trapped charge dating.