234
CORRECTION TO
PLANCK'S
THEORY
exclusively
the
positive
atom
ions
as
the carriers of heat in solids
[1]
(insulators)."
This
proposition does not
hold
up
in
two
respects:
First,
one
must
assume
not
only
positively, but
also
negatively
charged atom
ions. Second–
and this
is
the
essential
point-Drude's investigations
do not
justify the
assumption
that
every
elementary structure capable
of oscillation that
acts
as
a
carrier
of heat has
always
an
electric
charge. Thus,
from
the existence
of
[2]
an
absorption region
one can
indeed deduce (within
the limitations
mentioned)
the existence
of
a
kind
of elementary structure
that
makes
a
contribution with
[3]
a
characteristic
temperature
dependence
to
the
specific
heat;
however,
the
converse
conclusion is
not
valid,
because
most
certainly
there could exist
uncharged
heat carriers,
i.e., such
ones
that
are
not
observable
optically.
This is especially
to be expected
with
chemically
not
bound
atoms.
The
conclusion
drawn
from
the
nature of
the
specific
heat of
diamond
in
the last
sentence of
the
paper
hence
is also
not
legitimate.
It
should
read:
"Thus, according
to
the
theory,
it is
to
be expected
that
diamond
either
shows
an
absorption
maximum
at
y
=
11 u
or
that it
has
no
optically
demon-
strable infrared
proper
frequency
whatsoever."
[4]
(Received
on
3
March
1907)
Erratum
Vol.
22,
p.
287,
line
4
from
the
bottom
in
equation
(2), the letter
i
should
be
omitted.
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