1 CH3Br, Energetics for CH2+ and CH+ formations agust,www,...Mars10/PPT ak.ppt

2 CH 2 + formation? Methylene CH2 Chemical structure: 1) CH2 -> CH2+ + e-: QuantityValueUnitsMethodReferenceComment IE (evaluated) ± 0.003eVN/AN/AL : cm-1

3 2)CH3 + -> CH2+ + H: Methyl cation (CH3+) CH3 CH3+ + e- CH2 + H CH2+ + e- + H x IE(CH2) = cm-1 (see above) IE(CH3) = cm-1 DE(CH3) = cm-1 See: QuantityValueUnitsMethodReferenceComment IE (evaluated)9.84 ± 0.01eVN/AN/AL x X= = cm-1

4 CH+ formation: CH: Methylidyne (CH) 1) CH -> CH+ + e- QuantityValueUnitsMethodReferenceComment IE (evaluated)10.64 ± 0.01eVN/AN/AL x ,34 cm-1

5 2) CH3+ -> CH+ + H + H CH3+ -> CH+ + H2 CH3 CH3+ CH2 + H CH + H + H CH+ + H + H CH+ + H2 IE(CH3) = cm-1 See above) DE(CH3) = cm-1 See above DE(CH2) = cm cm-1 See above x DE(H2)= cm-1 x = = cm-1 CH3+ -> CH+ + H + H; = cm-1 CH3+ -> CH+ + H2; cm-1

6 Summary: cm-1 CH2 -> CH2+ + e CH3 + -> CH2+ + H: CH -> CH+ + e-85817,34 CH3+ -> CH+ + H + H CH3+ -> CH+ + H