Timing and spectral observation of 1RXS J171824.2-402934

We propose to perform an {it XMMNewton} observation of the very faint neutronstar low mass Xray binary 1RXS J171824.2402934 to investigate the presence ofa coherent pulsation in the persistent emission of the source. In case ofdetection this will be the first ever detected persistent source with pulsedemission from an accreting neutron star. In case of non detection theobservation will be a emph{crucial experiment} to select current theories ofpulse formation. We will also perform for the first time an aperiodic timinganalysis to search for quasi periodic oscillations that if detected, will giveus precious information about the physics of the system. A spectral study willbe also be performed improving previous Chandra observations. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]