Ab initio nonadiabatic calculation of the sensitivity coefficients for the X-1 Sigma(+)(g)-> B-1 Sigma(+)(u); C-1 Pi(u) lines of H-2 to the proton-to-electron mass ratioстатья
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Аннотация: Ab initio nonadiabatic calculations of the wavelengths lambda(ij) of the
individual lines of the Lyman X-1 Sigma(+)(g) -> B-1 Sigma(+)(u) and
Werner X-1 Sigma(+)(g) -> C-1 Pi(u) series of molecular hydrogen and
corresponding sensitivity coefficients K-ij = dln lambda(ij)/dln gamma
have been performed. These quantities are necessary for testing a
possible change in the proton-to-electron mass ratio gamma = m(p)/m(e),
in the process of cosmological evolution. The basic contribution to K-ij
comes from the difference between the average kinetic energies of
vibrations of combined states. Nonadiabatic interactions are important
for a small number of locally-perturbed rovibrational levels of the B-1
Sigma(+)(u) and C-1 Pi(+)(u) states, for which change in K-ij that is
caused by nonadiabatic effects reaches 14\%, which can lead to a
significant systematic shift in the estimate of the parameter gamma.