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}}</ref> the first clear account in English of the experimental phenomenology of the effect he had called "autoelectronic emission". He had worked on this topic, in Leipzig, since about 1910. Kleint describes this and other early work.<ref name=Kleint1993>{{cite journal|title = On the early history of field emission including attempts of tunneling spectroscopy|year = 1993|author = Kleint, C.|journal = Progress in surface science|pages = 101–115|volume = 42|issue = 1–4|doi=10.1016/0079-6816(93)90064-3|bibcode = 1993PrSS...42..101K }}</ref><ref name=Kleint2004>{{cite journal|title = Comments and references relating to early work in field electron emission|year = 2004|author = Kleint, C.|journal = Surface and Interface Analysis|pages = 387–390|volume = 36|issue = 56|doi=10.1002/sia.1894}}</ref>
After 1922, experimental interest increased, particularly in the groups led by [[Robert Andrews Millikan|Millikan]] at the California Institute of Technology (Caltech) in [[Pasadena, California]],<ref name=Millikan1926>{{cite journal|title = Laws governing the pulling of electrons out of metals under intense electrical fields|year = 1926|journal = Phys. Rev.|pages = 51–67|volume = 27|last1 = Millikan|first1 = R.A.|last2 = Eyring|first2 = C.F.|doi=10.1103/PhysRev.27.51|bibcode = 1926PhRv...27...51M }}</ref> and by Gossling at the [[General Electric Company]] in London.<ref>{{cite journal|author=B. S. Gossling|journal=Phil. Mag. |volume=1|year=1926|page=609}}</ref> Attempts to understand autoelectronic emission included plotting experimental current-voltage (''i - V'') data in different ways, to look for a straight-line relationship. Current increased with voltage more rapidly than linearly, but plots of type (log(''i'') vs. ''V'') were not straight.<ref name="Millikan1926"/> [[Walter H. Schottky|Schottky]]<ref>{{cite journal|title = Uber kalte und warme Elektronenentladungen|year = 1923|journal = Zeitschrift für Physik A|pages = 63–106|volume = 14|issue = 63|last1 = Schottky |first1 = W.|doi=10.1007/bf01340034
|bibcode = 1923ZPhy...14...63S }}</ref> suggested in 1923 that the effect might be due to thermally induced emission over a field-reduced barrier. If so, then plots of type (log(''i'') vs. ''V''<sup>1/2</sup>) should be straight; but they were not.<ref name="Millikan1926"/> Nor is Schottky's explanation compatible with the experimental observation of only very weak temperature dependence in CFE<ref name="Lilienfeld1922"/> – a point initially overlooked.<ref name="Richardson"/>
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