an electron that is emitted from an atom or molecule by an incident photon 
                                                            
                                                     
                        
                                                
                        
                        
                            an electron that has gained kinetic energy from a photon.
                                                            
                                                     
                        
                                                
                        
                        
                            This is the electron emitted from a sample when it is irradiated with high energy ultraviolet radiation, as observed in Photoelectron Spectroscopy.
                                                            
                                                     
                        
                                                
                        
                        
                            free electron produced by photoionization.