390
DOC.
24
DISCUSSION OF
GDNA LECTURES
a
kind of radiation that
is
at
certain
temperatures
essentially
identical
to
thermal
radiation.
[2]
Rubens:
But,
from the
absorption experiments
with
mercury vapor
one can surely
draw
the
conclusion
that the
long-wave
radiation
is
most
likely
to
originate
from
charged
ions
rather than from neutral
molecules. This would
support
the
view advanced
by
Mr.
Lindemann. If
a
gas
can
be ionized
through
a mere
increase
in
the
temperature,
which,
incidentally,
is
not
yet
quite certain,
then
it would
hardly
be
possible
to draw
a
sharp
line
between luminescence and thermal
radiation, at
least
in
the
high
temperature
range, on
the
basis
of the old
definitions.
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