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XPS physics - the photoelectric effect.. Because the energy of an X-ray with particular wavelength is known (for Al K α X-rays, E photon = 1486.7 eV), and because the emitted electrons' kinetic energies are measured, the electron binding energy of each of the emitted electrons can be determined by using the photoelectric effect equation,
Electron spectroscopy refers to a group formed by techniques based on the analysis of the energies of emitted electrons such as photoelectrons and Auger electrons.This group includes X-ray photoelectron spectroscopy (XPS), which also known as Electron Spectroscopy for Chemical Analysis (ESCA), Electron energy loss spectroscopy (EELS), Ultraviolet photoelectron spectroscopy (UPS), and Auger ...
The origin of language, its relationship with human evolution, and its consequences have been subjects of study for centuries.Scholars wishing to study the origins of language draw inferences from evidence such as the fossil record, archaeological evidence, contemporary language diversity, studies of language acquisition, and comparisons between human language and systems of animal ...
The highly diverse Nilo-Saharan languages, first proposed as a family by Joseph Greenberg in 1963 might have originated in the Upper Paleolithic. [1] Given the presence of a tripartite number system in modern Nilo-Saharan languages, linguist N.A. Blench inferred a noun classifier in the proto-language, distributed based on water courses in the Sahara during the "wet period" of the Neolithic ...
In historical or evolutionary linguistics, monogenesis and polygenesis are two different hypotheses about the phylogenetic origin of human languages. According to monogenesis, human language arose only once in a single community, and all current languages come from the first original tongue.
Reflex is the name given to a descendant word in a daughter language, descended from an earlier language. For example, Modern English heat is the reflex of the Old English hǣtu. Rarely, this word is used in reverse, and the reflex is actually the root word rather than the descendant word.
By analysis of related languages by the comparative method, linguists can make inferences about their shared parent language and its vocabulary. In that way, word roots that can be traced all the way back to the origin of, for instance, the Indo-European language family have been found.
Linguistics is the scientific study of language, [1] involving analysis of language form, language meaning, and language in context. [2]Language use was first systematically documented in Mesopotamia, with extant lexical lists of the 3rd to the 2nd Millennia BCE, offering glossaries on Sumerian cuneiform usage and meaning, and phonetical vocabularies of foreign languages.