Last Updated：2025/11/26
(quantum mechanics, quantum electrodynamics) A small difference between the energy levels 2S_½ and 2P_½ of the hydrogen atom, not predicted by the Dirac equation, whose detection in the Lamb–Retherford experiment of 1947 foreshadowed the development of quantum electrodynamics (in which the discrepancy is explained to be an effect of the emission and re-absorption of virtual photons); such a difference between otherwise expectedly equal energy levels of hydrogen or any other type of atom.
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Lamb shift
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Source Word
Lamb shift
Noun
(quantum
mechanics,
quantum
electrodynamics)
A
small
difference
between
the
energy
levels
2S_½
and
2P_½
of
the
hydrogen
atom,
not
predicted
by
the
Dirac
equation,
whose
detection
in
the
Lamb–Retherford
experiment
of
1947
foreshadowed
the
development
of
quantum
electrodynamics
(in
which
the
discrepancy
is
explained
to
be
an
effect
of
the
emission
and
re-absorption
of
virtual
photons);
such
a
difference
between
otherwise
expectedly
equal
energy
levels
of
hydrogen
or
any
other
type
of
atom.
Japanese Meaning
水素原子の2S₁/₂と2P₁/₂エネルギー準位の間に見られる微小なエネルギー差。これはディラック方程式では予測されず、1947年のランブ‐レターフォード実験により発見された現象で、量子電磁力学において仮想光子の放出と再吸収の影響で説明される。
Sense（1）
(quantum
mechanics,
quantum
electrodynamics)
A
small
difference
between
the
energy
levels
2S_½
and
2P_½
of
the
hydrogen
atom,
not
predicted
by
the
Dirac
equation,
whose
detection
in
the
Lamb–Retherford
experiment
of
1947
foreshadowed
the
development
of
quantum
electrodynamics
(in
which
the
discrepancy
is
explained
to
be
an
effect
of
the
emission
and
re-absorption
of
virtual
photons);
such
a
difference
between
otherwise
expectedly
equal
energy
levels
of
hydrogen
or
any
other
type
of
atom.
（ plural ）
