  We propose the new method of essential decrease of transit-time broadening of
Doppler-free absorption resonances on transitions between long-lived quantum
levels of atoms (or molecules) of a rarefied gas medium. This method is based
on preliminary optical pumping of the ground term of atoms (molecules) by
additional radiation which is spatially separated from the recording light
beam. The proposed method may be applied in atomic (molecular) spectroscopy of
ultra high resolution and also in frequency and time standards.
