surface_chem_FTIR lab_day7 surface_chem_FTIR lab_day7_b surface_chem_FTIR lab_day7_c surface_chem_FTIR lab_day7_d surface_chem_FTIR lab_day7_e surface_chem_FTIR lab_day7_f surface_chem_lab_day6 surface_chem_lab_day6_b surface_chem_lab_day6_d surface_chem_presentations_day6