cryogenic CCD operation

[Barry E. Burke]

Posted to CCD-world:
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Correction!  The ionization energies for the donor species in silicon range
from 39 meV for antimony to 54 meV for arsenic (not ~ 10 meV as I mentioned
previously).  In any case, this is large compared to kT=6 meV at 70 K,
which is why donors cease to be ionized at these low temperatures.

Barry Burke
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