Quantum yield for carbon monoxide production in the 248 nm photodissociation of carbonyl sulfide (OCS)

Journal Article · Wed Mar 01 04:00:00 EST 1995 · Geophysical Research Letters

DOI:https://doi.org/10.1029/95GL00170· OSTI ID:183355

Zhao, Z; Stickel, R E; Wine, P H ^[1]

---

1. Georgia Institute of Technology, Atlanta, GA (United States)

Tunable diode laser absorption spectroscopy has been coupled with excimer laser flash photolysis to measure the quantum yield for CO production from 248 nm photodissociation of carbonyl sulfide (OCS) relative to the well known quantum yield for CO production from 248 nm photolysis of phosgene (Cl{sub 2}CO). The temporal resolution of the experiments was sufficient to distinguish CO formed directly by photodissociation from that formed by subsequent S({sup 3}P{sub j}) reaction with OCS. Under the experimental conditions employed, CO formation via the fast S({sup 1}D{sub 2})+OCS reaction was minimal. Measurements at 297K and total pressures from 4 to 100 Torr N{sub 2}+N{sub 2}O show the CO yield to be greater than 0.95 and most likely unity. This result suggests that the contribution of OCS as a precursor to the lower stratospheric sulfate aerosol layer is somewhat larger than previously thought. 25 refs., 1 fig., 2 tabs.

• OSTI ID: 183355
• Journal Information: Geophysical Research Letters, Journal Name: Geophysical Research Letters Journal Issue: 5 Vol. 22; ISSN GPRLAJ; ISSN 0094-8276
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
CARBON MONOXIDE
CARBON OXYSULFIDE
CHEMICAL REACTION YIELD
DISSOCIATION
PHOTOLYSIS