BrCl elimination from Coulomb explosion of 1,2-bromochloroethane induced by intense femtosecond laser fields.

By using a dc-slice imaging technique, photodissociation of 1,2-CHBrCl was investigated at 800 nm looking for heteronuclear unimolecular ion elimination of BrCl in an 80 fs laser field. The occurrence of fragment ion BrCl in the mass spectrum verified the existence of a unimolecular decomposition channel of BrCl in this experiment. The relative quantum yield of the BrCl channel was measured to be 0.

Theoretical and experimental studies on hydrogen migration in dissociative ionization of the methanol monocation to molecular ions H and HO.

The dissociative ionization processes of the methanol monocation CHOH to H + CHO and HO + CH are studied by method, and hydrogen migration processes are confirmed in these two dissociation processes. Due to the positive charge assignment in dissociation processes, the fragmentation pathways of CHOH to H + CHO and CHOH to HO + CH are also calculated. The calculation results show that a neutral H moiety in the methanol monocation CHOH is the origin of the formation of H , and the ejection of fragment ions H and HO is more difficult than CHO and CH respectively.