Electronic Supplementary Information for Dissociation dynamics and thermochemistry of tin species, (CH 3 ) 4 Sn and (CH 3 ) 6 Sn 2 , by Threshold Photoelectron-Photoion Coincidence Spectroscopy Juan Z. Dávalos, a Rebeca Herrero, a Nicholas Shuman, b and Tomas Baer b a CSIC, Instituto de Química Física Rocasolano, c/ Serrano 119, Madrid, 28006 Spain. b Department of Chemistry, University of North Carolina, Chapel Hill, NC 27599 Topics S1. Computational Results S2. Diagram of energies of Me 5 Sn 2 + and its dissociation products. S3.: DSC Measurements: Purity and Phase Transition Control S4. Knudsen-Effusion method: Heat of sublimation S5. Heat of vaporization at T=298.15K S6. Theoretical enthalpy of formation of Me 3 SnH References