70 th International Symposium on Molecular Spectroscopy

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Presentation transcript:

70 th International Symposium on Molecular Spectroscopy FD10 193 nm photodissociation of Methyl Isothiocyanate using chirped pulse uniform flow spectroscopy (CPUF) Nuwandi M. Ariyasingha, Lindsay N. Zack, Chamara Abeysekera, Baptist Joalland, Arthur Suits Wayne State University

Widely used in agriculture 70 th International Symposium on Molecular Spectroscopy MITC Widely used in agriculture Metam sodium Soil fumigant Pesticide Fungicide Herbicide Volatile Vapor pressure ~ 21 mmHg Direct photolysis Adverse health effects

CH3 + NCS CH3NCS CH3S + CN CH3NC + S Previous studies 70 th International Symposium on Molecular Spectroscopy CH3 + NCS vibrational excited and ground state CH3NC vibrational excited and ground state NCS Electronic excited states of CN CH3S + CN CH3NC + S CH3NCS Northrup, F. J.; Sears, T. J. J. Chem. Phys. 1990, 93, 2337-2345 Hall, G. E.; Wu, M. J. Phys. Chem. 1993, 97, 10911-10919 Wade, E. A.; Pore, J. L.; Osborn, D. L. J. Phys. Chem. A. 2011, 115, 5319–5323

Chirped Pulse in Uniform Flow (CPUF) 70 th International Symposium on Molecular Spectroscopy Instrumentation and Method Chirped Pulse in Uniform Flow (CPUF)

Instrumentation and Method 70 th International Symposium on Molecular Spectroscopy Instrumentation and Method Pulsed Uniform Supersonic Flow system High density flows (1016 cm-3) Uniform, collimated flows Constant pressure Temperature (22K/26K)

Instrumentation and Method 70 th International Symposium on Molecular Spectroscopy Instrumentation and Method ~ 1 % MITC in the bubbler Carrier gas He Rotational spectra collected at 10 s intervals after laser trigger and first chirped pulsed excitation

Results 70 th International Symposium on Molecular Spectroscopy 1. MITC frames 1 to 12 laser on 100 k aquisitions

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Conclusion and discussion 70 th International Symposium on Molecular Spectroscopy Conclusion and discussion CH3NC and NCS consistent with previous studies First detection of H2CS, HCN,HNC and CH3CN CH2S + HCN / HNC CH3 + NCS CH3S + CN CH3NC / CH3CN + S CH3NCS

Future work Complete the study on MITC , theoretical calculation MTC 70 th International Symposium on Molecular Spectroscopy Future work Complete the study on MITC , theoretical calculation MTC

Acknowledgement Suits Group Members DOE & NSF for funding 70 th International Symposium on Molecular Spectroscopy Acknowledgement Suits Group Members DOE & NSF for funding

70 th International Symposium on Molecular Spectroscopy Thank You