  We report muon spin rotation measurements of the local magnetic
susceptibility around a positive muon in the paramagnetic state of the quasi
one-dimensional spin 1/2 antiferromagnet dichlorobis (pyridine) copper (II).
Signals from three distinct sites are resolved and have a temperature dependent
frequency shift which is significantly different than the magnetic
susceptibility. This difference is attributed to a muon induced perturbation of
the spin 1/2 chain. The obtained frequency shifts are compared with Transfer
Matrix DMRG numerical simulations.
