The report describes the electron capture properties and ensuing fragmentation pattern of 11 chemical agent simulants: (1) DMMP (2) DIMP (3) nBM (4) 2CLES (5) MS (6) TEP (7) DMP (8) DE3CLMP (9) DECLP (10) DECLMP (11) DECyMP. The electron attachment coefficient and drift velocity of the negative ions were measured by three techniques (1) time of flight mass spectrometry (2) electron swarm with pulse height analysis and (3) electron ...