Details

Autor(en) / Beteiligte

• van den Brom, Alrik J.
• Rakitzis, T. Peter
• Janssen, Maurice H. M.

Titel

State-to-state photodissociation of carbonyl sulfide ( ν 2 = 0 , 1 ∣ J l M ) .II. The effect of initial bending on coherence of S ( D 2 1 ) polarization

Ist Teil von

• The Journal of chemical physics, 2005-10, Vol.123 (16), p.164313-164313-8

Ort / Verlag

United States: American Institute of Physics

Erscheinungsjahr

2005

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Photodissociation studies using ion imaging are reported, measuring the coherence of the polarization of the S ( D 2 1 ) fragment from the photolysis of single-quantum state-selected carbonyl sulfide (OCS) at 223 and 230 nm . A hexapole state-selector focuses a molecular beam of OCS parent molecules in the ground state ( ν 2 = 0 ∣ J M = 10 ) or in the first excited bending state ( ν 2 = 1 ∣ J l M = 111 ) . At 230 nm photolysis the Im [ a 1 ( 1 ) ( || , ⊥ ) ] moment for the fast S ( D 2 1 ) channel increases by about 50% when the initial OCS parent state changes from the vibrationless ground state to the first excited bending state. No dependence on the initial bending state is found for photolysis at 223 nm . We observe separate rings in the slow channel of the velocity distribution of S ( D 2 1 ) correlating to single C O ( J ) rotational states. The additional available energy for photolysis at 223 nm is found to be channeled mostly into the C O ( J ) rotational motion. An improved value for the OC-S bond energy D 0 = 4.292 eV is reported.