VELOCITY MAP IMAGING STUDIES OF NON-CONVENTIONAL METHANETHIOL PHOTOCHEMISTRY Ben Toulson, Jon Alaniz & Craig Murray.

Slides:

Advertisements

Similar presentations

Conformer selective and vibrationally mediated photodissociation dynamics of propanal cation Lei Shen, Myunghwa Kim, Bailin Zhang, Arthur G. Suits Department.

Advertisements

David H. Parker Radboud University Nijmegen 3–5 February, 2015 Leiden 1.

Photodissociation of Methyl Nitrite from the S 2 state -- Ion Images and Vector Correlations Aidan Klobuchar, and Jeffrey Bartz Department of Chemistry,

Interplay Between Electronic and Nuclear Motion in the Photodouble Ionization of H 2 T J Reddish, J Colgan, P Bolognesi, L Avaldi, M Gisselbrecht, M Lavollée,

A New Spectroscopic Window on Hydroxyl Radicals and their Association Reactions of Significance in the Atmosphere Marsha I. Lester University of Pennsylvania.

Radical Intermediates in the Addition of OH to Propene: Photolytic Precursors and Angular Momentum Effects ISMS 2014 Matthew Brynteson, Carrie Womack,

CONCENTRATION, MATRIX AND WAVELENGTH DEPENDENCE IN THE PHOTOLYSIS EFFICIENCY OF MATRIX-ISOLATED BIACETYL CONCENTRATION, MATRIX AND WAVELENGTH DEPENDENCE.

Applications of photoelectron velocity map imaging at high resolution or Photoionization dynamics of NH 3 (B 1 E  ) Katharine L. Reid (Paul Hockett, Mick.

1 DETERMINATION OF DIFFERENTIAL CROSS SECTIONS OF THE STATE-TO-STATE INELASTIC COLLISIONS IN BULBS. A THREE-DIMENSIONAL SLICED FLUORESCENCE IMAGING STUDY.

Frequency and Time Domain Studies of Toluene Adrian M. Gardner, Alistair M. Green, Julia A. Davies, Katharine L. Reid and Timothy G. Wright.

Dynamics of Vibrational Excitation in the C 60 - Single Molecule Transistor Aniruddha Chakraborty Department of Inorganic and Physical Chemistry Indian.

Ultraviolet Photodissociation Dynamics of the Cyclohexyl Radical Michael Lucas, Yanlin Liu, Jingsong Zhang Department of Chemistry University of California,

Thomas J. Preston, Michael A. Shaloski, and F. Fleming Crim Infrared Transient Absorption Spectroscopy of Bromoform Isomerization.

II. Multi- photon excitation / ionization processes

Narrow transitions induced by broad band pulses  |g> |f> Loss of spectral resolution.

CH 3 Br: & Literature survey on Direct ion-pair state excitation vs Ion pair fomation via initial Rydberg state excitation (Rydberg doorway.

Iodine Molecular Interferometer and Inversion Symmetry Mat Leonard.

ULTRAFAST DYNAMICS IN NITRO- AND (ORGANOPHOSPHINE)GOLD(I)-POLYCYCLIC AROMATIC HYDROCARBONS R. Aaron Vogt, Christian Reichardt, Carlos E. Crespo-Hernández,

1 Femtosecond Time and Angle-Resolved Photoelectron Spectroscopy of Aqueous Solutions Toshinori Suzuki Kyoto University photoelectron.

Tapas Chakraborty Indian Association for the Cultivation of Science Calcutta, India MJ16, OSU ISMS 2013 Photochemistry of acetone in simulated atmosphere.

Evidence of Radiational Transitions in the Triplet Manifold of Large Molecules Haifeng Xu, Philip Johnson Stony Brook University Trevor Sears Brookhaven.

Carbon Nanotube Formation Detection of Ni atom and C 2 Gary DeBoer LeTourneau University Longview, TX NASA Johnson Space Center Thermal Branch Structures.

The Butler Group Benj FitzPatrick Britni Ratliff Bridget Alligood Doran Bennett Justine Bell Arjun Raman Emily Glassman Dr. Xiaonan Tang Molecular Beam.

Novel Approaches to Doppler-Free Ion Imaging I. Two-Color Reduced-Doppler Imaging II. Doppler-Free/Doppler-Sliced Imaging Cunshun Huang, Wen Li, Sridhar.

Ultraviolet Photodissociation Dynamics of the 3-Cyclohexenyl Radical Michael Lucas, Yanlin Liu, Jasmine Minor, Raquel Bryant, Jingsong Zhang Department.

CHEM /10/12 I.B. Stratospheric chemistry: Ozone - The Chapman Mechanism - cont. Embedded Fundamentals - Photochemistry  KEEP READING CH 1  HW#3.

Neutron Skin of 208 Pb from Coherent Pion Photoproduction Crystal Ball detector Neutron Skin 208 Pb (γ, π 0 ) measurements Model-independent correlation.

Photoinduced Electron Transfer in a Prototypical Mulliken Donor-Acceptor Complex: C 2 H 4 ∙∙∙ Br 2 OSU 66 th International Symposium on Molecular Spectroscopy.

The Ohio State UniversityDepartment of Chemistry Ultrafast Vibrational Cooling Dynamics in 9Methyladenine Observed with UV Pump/UV Probe Transient Absorption.

MOTIVATIONS : Atmospheric Chemistry Troposphere Chemistry – Ozone Production RO 2 + NO → RO + NO 2 NO 2 → NO + O( 3 P) O( 3 P) + O 2 + M → O 3 + M.

A 4D wave packet study of the CH 3 I photodissociation in the A band. Comparison with femtosecond velocity map imaging experiments A. García-Vela 1, R.

Department of Chemistry

Effects of Reactant Rotational excitation on Cl + CH 4 / CHD 3 Reactions Speaker: Huilin Pan Supervisor: Kopin Liu 69 th ISMS, June 16-20, 2014.

Photodissociation dynamics of 1-propenyl radical Michael Lucas, Yu Song, Jingsong Zhang*, Department of Chemistry University of California, Riverside Riverside,

The University of Illinois-Urbana Champaign

Current team Mikhail Ryazanov Dr. Chirantha Rodrigo Overtone-induced dissociation and isomerization of the hydroxymethyl (CH 2 OH) radical First team:

Vibrational Predissociation Spectra in the Shared Proton Region of Protonated Formic Acid Wires: Characterizing Proton Motion in Linear H-Bonded Networks.

Photoionization induced intermolecular proton transfer in the CH ●●● O hydrogen bonded cyclopentanone dimer in the gas phase Arup K. Ghosh, Piyali Chatterjee.

Slow Photoelectron Velocity-map Imaging Spectroscopy

Molecular Spectroscopy OSU June TRANSIENT ABSORPTION AND TIME-RESOLVED FLUORESCENCE STUDIES OF SOLVATED RUTHENIUM DI-BIPYRIDINE PSEUDO-HALIDE.

Dynamical “Fingerprinting” in Formaldehyde Dissociation Steven J. Rowling Scott H. Kable Sridhar A. Lahankar Arthur G. Suits.

Development of a cavity ringdown spectrometer for measuring electronic states of Be clusters JACOB STEWART, MICHAEL SULLIVAN, MICHAEL HEAVEN DEPARTMENT.

Photoelectron Imaging of Vibrational Autodetachment from Nitromethane Anions Chris L. Adams, Holger Schneider, J. Mathias Weber JILA, University of Colorado,

Main Title Manori Perera 1 and Ricardo Metz University of Massachusetts Amherst 64 th International Symposium on Molecular Spectroscopy June 25th, 2009.

Near-Infrared Photochemistry of Atmospheric Nitrites Paul Wennberg, Coleen Roehl, Geoff Blake, and Sergey Nizkorodov California Institute of Technology.

Imaging studies of S + fragments from the UV photolysis of state selected H 2 S + cations A.D. Webb, R.N. Dixon and M.N.R. Ashfold School of Chemistry,

Reversibility of intersystem crossing in the ã 1 A 1 (000) and ã 1 A 1 (010) states of methylene, CH 2 ANH T. LE, TREVOR SEARS a, GREGORY HALL Department.

* Funded by NSF. Xiujuan Zhuang and Timothy C. Steimle* Department of Chemistry and Biochemistry Arizona State University, Tempe,AZ Neil Reilly,

1 Integrity  Service  Excellence 22 June 2015 Justin W. Young Boston College Institute for Scientific Research Jaime A. Stearns Space Vehicles Directorate.

Heavy Atom Vibrational Modes and Low-Energy Vibrational Autodetachment in Nitromethane Anions Michael C. Thompson, Joshua H. Baraban, Devin A. Matthews,

Velocity Map Imaging Study of a Mass-Selected Ion Beam: the Photoinitiated Charge-Transfer Dissociation of and Ag + (C 6 H 6 ) Jonathon A. Maner, Daniel.

Vibrationally Driven Hydrogen Abstraction Reaction of Bromine Radical in Solution Jae Yoon Shin, Michael A. Shalowski, F. Fleming Crim OSU International.

The Cl+H 2  HCl+H reaction induced by IR+UV irradiation of Cl 2 in solid parahydrogen Sharon C. Kettwich and David T. Anderson Department of Chemistry,

Predissociation of the A 2  + state of the SH (SD) radical A.J. Orr-Ewing, R.A. Rose, C.-H. Yang, K. Vidma and D.H. Parker.

Water network-mediated, electron induced proton transfer in anionic [C 5 H 5 N·(H 2 O) n ]¯ clusters: Size-dependent formation of the pyridinium radical.

Production of vibrationally hot H 2 (v=10–14) from H 2 S photolysis Mingli Niu.

Ultrafast Dynamics in DNA and RNA Derivatives Monitored by Broadband Transient Absorption Spectrscopy By Matthew M. Brister and Carlos E. Crespo-Hernández.

Resonance-enhanced Photoassociative Formation of Ground-state Rb 2 and Spectroscopy of Mixed-Character Excited States H.K. Pechkis, D. Wang, Y. Huang,

Ultrafast Excited State Raman Spectroscopy

Spectroscopic and Kinetic Studies of Atmospheric Free Radicals

Vinylidene! Stephen Gibson,1 Benjamin Laws,1 Ravin Fernando,2

Can Internal Conversion be Controlled by Mode-specific Vibrational Excitation in Polyatomic Molecules? Michael Epshtein, Alexander Portnov and Ilana Bar.

Vibrational state-dependent predissociation dynamics of ClO (A 23/2): Insight from final correlated state branching ratios Kristin S. Dooley1, Justine.

Characterization of CHBrCl2 photolysis by velocity map imaging

71 st International Symposium on Molecular Spectroscopy

Can Internal Conversion be Controlled by Mode-specific Vibrational Excitation in Polyatomic Molecules? Michael Epshtein, Alexander Portnov and Ilana Bar.

PUMP-PROBE DELAYED IONIZATION STUDY OF PHENYLACETYLENE

OBSERVATION OF LEVEL-SPECIFIC PREDISSOCIATION RATES IN S1 ACETYLENE

Fig. 1 Pump-probe signatures of vermilion (red HgS), black HgS, and metallic Hg. Pump-probe signatures of vermilion (red HgS), black HgS, and metallic.

Time-Resolved Recombination Dynamics of Large IBr-(CO2)n (n=11-14) Clusters Joshua P. Martin, Joshua P. Darr, Jack Barbera, Matt A. Thompson, Robert.

Presentation transcript:

VELOCITY MAP IMAGING STUDIES OF NON-CONVENTIONAL METHANETHIOL PHOTOCHEMISTRY Ben Toulson, Jon Alaniz & Craig Murray

Examples of non-conventional photochemical mechanism: R. D. van Zee et al., J. Chem. Phys., 1993, 99, 1664 A. Suits et al., Acc. Chem. Res. 2008, 41, 873 H 2 CO  CO (v = 0, j =15, 28, 40) + H 2 (v’,j’) j CO = 40 j CO = 28 j CO = 15 A. Suits, J. Bowman et al., Science, 2004, 306, (5699), 1158 Others: NO 3, acetaldehyde

3+1 REMPI of NH via D 3 Π–X 3 Σ – transition NH + ion signal /arb. S 1 T 1 J. Thomas et al., J. Phys. Chem. Lett., 2012, 3, IC ~ 0.24 cm -1 k ISC ~ 0.6 x10 9 s -1 k pr ~ 2.6 x10 12 s -1 CH 3 NH 2 : Roaming-mediated intersystem crossing?

CH 3 SH photodissociation CH 3 SH + h →CH 3 S + H ΔH = 3.73 eV → CH 3 + SH ΔH = 3.08 eV → CH 4 + S( 3 P J, 1 D 2 ) G. Vaghjiani. J. Chem. Phys., 1993, 99, 5936 New primary photoproduct? E. Jensen et al., J. Chem. Phys., 1993, 98, 2882

Velocity map imaging correlated properties of photofragment distributions (internal energy, anisotropy) S. Greaves, R. Rose, A.J. Orr-Ewing, Phys. Chem. Chem. Phys. 2010, 12, 9129 R. Livingstone et al. J. Chem. Phys. 2012,137, αvαv time-of-flight 

Sulfur 2+1 REMPI, λ photolysis = 235 nm 3PJ3PJ 1D21D2 wavelength / nm

CH 3 S photodissociation? λ / nm 3P2:3P1:3P03P2:3P1:3P a 51:35: a 57:30:13 a. H. Bise et al., J. Chem. Phys. 110, 805 (1999) b. This work CH 3 S + h pump → CH 3 + S( 3 P J ) + h probe → CH 3 + S( 3 P J ) λ / nm 3P2:3P1:3P03P2:3P1:3P0 Average ( ) a 88:6: a 15:42:43 No evidence currently suggests that CH 3 S absorbs at λ pump or λ probe S( 1 D 2 ) observed: inconsistent with CH 3 S photodissociation CH 3 SH + h → S( 3 P J )

λ photolysis = 235 nm 1D21D2 3P23P2 2° pump 2° probe 1°1° 2° pump 2° probe 1°1°

Conclusion & future work Complementary roles for theory and experiment Roaming-mediated intersystem crossing in CH 3 NH 2 ? Trends and generalized behaviors in CH 3 SH, CH 3 NH 2

Prof. Craig Murray Jonathan Alaniz Liz Hargreaves Catherine Adams Acknowledgements

S( 3 P J ) photoproducts, λ photolysis = 235 nm 3P13P1 3P03P0 3P23P2