Lebedev, Pyotr Nikolaevich
Classics of natural science
sb41-2.pdf p. 84 - 150
Lebedev P.N. Selected works (edited
by Professor A.K. Timiryazev. Moscow-Leningrad: State Publishing House of TECHNICAL-THEORETICAL
LITERATURE. - 1949, 244 p., With illustrations)
"...In the interpretation of light oscillations as electromagnetic processes,
there is also another hidden problem, which has not yet been touched upon, about the processes ,
that take place in a molecular vibrator at the time when it gives off
light energy to the surrounding space. From the point of view
of the electromagnetic theory of light, between two emitting molecules,
as between two vibrators, there are ponderomotive forces: they
are caused by electrodynamic interactions of alternating electric
currents in molecules (according to Ampere's laws) or alternating charges in them
(according to Kulon's laws). There are molecular forces between the molecules,
the cause of which is inextricably linked with the processes of radiation.
These forces do not depend on the masses of molecules, they are associated with their
individual (spectral) properties and, moreover, are highly dependent on
temperature, that is, they have exactly the properties that we attribute
to molecular forces in the phenomena of cohesion, dissolution
or chemical reactions."
" ...Despite all the difference,
which are by their physical nature, electromagnetic, hydrodynamic
and acoustic vibrations, the laws of their ponderomotive action on the
corresponding resonators are identical; this indicates to us
the probability that the found elementary laws are universal for all
possible (and not yet investigated by us) oscillations, and their
justification must be sought in reasons that do not depend on the
features of the operating oscillation and the resonator excited by it."
"...The main interest of studying the ponderomotive action
of wave-like motion lies in the fundamental possibility
of extending the found laws to the region of light and thermal
emission of individual molecules of the body and predicting
the resulting intermolecular forces and their magnitude.
...Until it is impossible to say in which direction further studies of
these questions should go in order to reach a definitive answer
in the shortest possible way: there are no data that allow us to say
anything definite about the properties of resonator molecules.
Translated by Shironosova O.E.
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