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. Author manuscript; available in PMC: 2016 May 27.
Published in final edited form as: Appl Phys Rev. 2016 Mar 24;3(1):011302. doi: 10.1063/1.4944491

FIG. 3.

FIG. 3

Source emittance for the gas field ionization source (GFIS), liquid metal ion source (LMIS), inductively couple plasma (ICP) source, and cold atom source. Each source is characterized by a point on the graph according to its size σx and temperature kBT/2. The emittance ε is given by Eq. 3. Lines of constant emittance go diagonally from upper left to lower right.