AN S80 FLT IS MANDATED TO RETURN LAND AFTER THE CREW FELT WHAT WAS DETERMINED TO BE A COMPRESSOR STALL ON THE STARBOARD ENGINE AFTER TKOF FROM DFW; TX.

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WE DEPARTED DFW ENROUTE TO SMF. APPROX 4 MIN INTO THE FLT CLIMBING THROUGH 4300 FT WE HEARD A VERY LOUD BANG AND FELT A VERY HARD ABRUPT KICK FROM THE RIGHT SIDE OF THE ACFT. WE DIDN'T KNOW IF WE HAD HIT SOMETHING OF IF WE HAD EXPERIENCED A COMPRESSOR STALL. THE FO NOTICED A MOMENTARY FLUCTUATION OF THE R N1 AND EPR GAUGES; THEN ALL ENG INSTRUMENTS OPERATED NORMALLY. I DISCONNECTED THE AUTOTHROTTLE; REDUCED POWER AND LEVELED OFF AT 5000 FT. THE FA'S REPORTED HEARING A VERY LOUD BANG FROM THE R SIDE. I TOLD THEM WE WOULD BE RETURNING TO DFW; TO PREPARE THE CABIN FOR LANDING. NOT KNOWING THE EXTENT OF DAMAGE TO THE ENG OR AIRFRAME; IF THE ACFT WOULD REMAIN AIRWORTHY WE FELT UNABLE TO CONTINUE THE FLT AS PLANNED. WE DECLARED AN EMERGENCY; REQUESTED VECTORS TO RWY 18R; AND TO HAVE ARFF STANDING BY. WE MADE A NORMAL SMOOTH LANDING AT A WT OF 139200 LBS. WE WERE INSPECTED BY DFW FIRE CHIEF WITH A HEAT IMAGING CAMERA. NO FIRES OR HOT SPOTS WERE DETECTED SO WE ELECTED TO TAXI TO THE GATE TO DEPLANE THE PASSENGERS.