HSO3Cl: a prototype molecule for studying OH-stretching overtone induced photodissociationElectronic supplementary information (ESI) available. See DOI: 10.1039/c5cp07319g
Vibrationally induced photodissociation in sulfurochloridic acid (HSO 3 Cl) is found to be a viable process to form SO 3 and HCl from excitations of the OH-stretching overtone starting at ν OH = 4. Reactive molecular dynamics simulations on a fully-dimensional potential energy surface fitted to MP2...
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Zusammenfassung: | Vibrationally induced photodissociation in sulfurochloridic acid (HSO
3
Cl) is found to be a viable process to form SO
3
and HCl from excitations of the OH-stretching overtone starting at
ν
OH
= 4. Reactive molecular dynamics simulations on a fully-dimensional potential energy surface fitted to MP2 calculations show that hydrogen transfer and HCl elimination compete with one another on the nanosecond time scale. Excitation with 5 and 6 quanta in the OH-stretch direct elimination of HCl is a dominant process on the several hundred picosecond time scale. At longer times, HCl formation is preceded by intramolecular hydrogen transfer and concomitant excitation of torsional degrees of freedom. As HSO
3
Cl is a suitable proxy for H
2
SO
4
, which is relevant for weather and climate in the upper atmosphere, it is concluded that vibrationally induced photodissociation is a possible mechanism for H
2
SO
4
decomposition. Final state energy distributions for different internal degrees of freedom are predicted which should be observable in laboratory measurements.
Vibrationally induced photodissociation in sulfurochloridic acid (HSO
3
Cl) is found to be a viable process to form SO
3
and HCl from excitations of the OH-stretching overtone starting at
ν
OH
= 4. |
---|---|
ISSN: | 1463-9076 1463-9084 |
DOI: | 10.1039/c5cp07319g |