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70 th International Symposium on Molecular Spectroscopy

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Presentation on theme: "70 th International Symposium on Molecular Spectroscopy"— Presentation transcript:

1 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

2 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

3 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, Hall, G. E.; Wu, M. J. Phys. Chem. 1993, 97, Wade, E. A.; Pore, J. L.; Osborn, D. L. J. Phys. Chem. A. 2011, 115, 5319–5323

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

5 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)

6 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

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

8 70 th International Symposium on Molecular Spectroscopy
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17 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

18 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

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

20 70 th International Symposium on Molecular Spectroscopy
Thank You

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