  Over the past decades, cosmology has become largely based on experimental
data, the most important sources of which are studies of the cosmic microwave
background (CMB). CMB is present in the Universe since the very first moments
of its existence, and the features of CMB recorded now reflect the fundamental
processes of the evolution of the Universe. These processes cause a weak
anisotropy of CMB, which is no more than 0.01 percent. The structure of
anisotropy, which is interpreted on the basis of a sufficiently detailed
standard theory of primary recombination, allows us to establish the most
important cosmological parameters. One of these parameters is the Hubble
constant (more precisely, the Hubble parameter). However, the difference
between the value of the Hubble constant, obtained from the results of the
Planck mission, and obtained from independent local measurements, is 10%. Such
a big difference is called the Hubble tension problem, and is an important
problem of cosmology. The interpretation of the Planck measurements (as well as
the interpretation of WMAP results, where a close value of the Hubble constant
is obtained) is critically based on the predictions of the standard
recombination theory. This work shows that the recombination rate is higher
than predicted by standard theory and is caused by the excitation of the
kinetic degrees of freedom of hydrogen atoms, which is ignored by standard
theory. The calculations performed demonstrate that taking into account this
process leads to a good coincidence of the values of the Hubble constant
obtained from the results of the Planck experiment and local measurements.
