  Recently a data set containing linear and circular polarisation information
of a collection of six hundred pulsars has been released. The operative radio
wavelength for the same was 21 cm. Pulsars radio emission process is modelled
either with synchroton / superconducting self-Compton route or with curvature
radiation route. These theories fall short of accounting for the circular
polarisation observed, as they are predisposed towards producing, solely,
linear polarisation. Here we invoke (pseudo)scalars and their interaction with
photons mediated by colossal magnetic fields of pulsars, to account for the
circular part of polarisation data. This enables us to estimate the
pseudoscalar parameters such as its coupling to photons and its mass in
conjunction as product. To obtain these values separately, we turn our
attention to recent observation on 47 pulsars, whose absolute polarisation
position angles have been made available. Except, a third of the latter set,
the rest of it overlaps with the expansive former data set on polarisation type
\& degree. This helps us figure out, both the pseudoscalar parameters
individually, that we report here.
